Nextcloud MacOs client delete files because of "conflicts"

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Nextcloud version (eg, 20.0.5): 22.2.0-apache
Operating system and version (eg, Ubuntu 20.04): ubuntu
PHP version (eg, 7.4): 7.4.3

The issue you are facing: When I add folders or files in my NC client, the files/folders are deleted and I got a message in NC client that says : Conflicts when sending a file, it will be deleted.
But here is no comflict… And if I create it from the web interface, it works…

Is this the first time you’ve seen this error? (Y/N): Y

Steps to replicate it:

  1. Create a folder in my Nextcloud client.
  2. Wait for it’s delete.

The output of your Nextcloud log in Admin > Logging: (Here, I Tried to create a folder in Prog/)

2021-10-14 10:22:51:442 [ info nextcloud.sync.accessmanager ]:	6 "PROPFIND" "https://nextcloud.name.ch/remote.php/dav/files/name/" has X-Request-ID "55dc8a5f-c802-4d6e-b228-41f73bfbb255"
2021-10-14 10:22:51:442 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYk6j3QZOxzR6w89LAfZrHabpcg4a8GIoH13dpK6USJ60JWVc5bUqWpKBt49msaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ab5d7e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:22:51:442 [ info nextcloud.sync.networkjob ]:	OCC::LsColJob created for "https://nextcloud.name.ch" + "/" "OCC::FolderStatusModel"
2021-10-14 10:22:51:509 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:22:51:510 [ info nextcloud.sync.networkjob.lscol ]:	LSCOL of QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") FINISHED WITH STATUS "OK"
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 1
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path FROM selectivesync WHERE type=?1"
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 3
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path FROM selectivesync WHERE type=?1"
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Appartement Fribourg"
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Développement"
2021-10-14 10:22:51:511 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Dossier name"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "EPFL"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Factures"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Films et photos name"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "HEIA"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Impots"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "JAPON Edited"
2021-10-14 10:22:51:512 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "MJSR"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Photos et films de famille"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Serveur"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Service civil"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Stage état de vaud"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 "Zivi recours"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path, inode, modtime, type, md5, fileid, remotePerm, filesize,  ignoredChildrenRemote, contentchecksumtype.name || ':' || contentChecksum, e2eMangledName, isE2eEncrypted  FROM metadata  LEFT JOIN checksumtype as contentchecksumtype ON metadata.contentChecksumTypeId == contentchecksumtype.id WHERE e2eMangledName=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::bindValue ]:	SQL bind 1 3
2021-10-14 10:22:51:513 [ debug nextcloud.sync.database.sql ]	[ OCC::SqlQuery::exec ]:	SQL exec "SELECT path FROM selectivesync WHERE type=?1"
2021-10-14 10:22:51:513 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::LsColJob finished for "/"
2021-10-14 10:22:51:644 [ info nextcloud.gui.folder.manager ]:	<========== Sync finished for folder [Nextcloud] of account [name@nextcloud.name.ch] with remote [https://nextcloud.name.ch/remote.php/dav/files/name/]
2021-10-14 10:22:51:644 [ info nextcloud.gui.folder ]:	Trying to check "https://nextcloud.name.ch/remote.php/dav/files/name/" for changes via ETag check. (time since last sync: 0 s)
2021-10-14 10:22:51:644 [ debug nextcloud.gui.folder.manager ]	[ OCC::FolderMan::slotRunOneEtagJob ]:	Scheduling "https://nextcloud.name.ch/remote.php/dav/files/name/" to check remote ETag
2021-10-14 10:22:51:644 [ info nextcloud.sync.accessmanager ]:	6 "PROPFIND" "https://nextcloud.name.ch/remote.php/dav/files/name/" has X-Request-ID "a6b52631-d843-4a50-a064-c9e381353cfc"
2021-10-14 10:22:51:644 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYmsaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ad139c136e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:22:51:645 [ info nextcloud.sync.networkjob ]:	OCC::RequestEtagJob created for "https://nextcloud.name.ch" + "/" "OCC::Folder"
2021-10-14 10:22:51:929 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:22:51:929 [ info nextcloud.sync.networkjob.etag ]:	Request Etag of QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") FINISHED WITH STATUS "OK"
2021-10-14 10:22:51:930 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::RequestEtagJob finished for "/"
2021-10-14 10:22:53:904 [ debug nextcloud.gui.folderwatcher ]	[ OCC::callback ]:	FolderWatcherPrivate::callback by OS X
2021-10-14 10:22:53:905 [ debug nextcloud.gui.folderwatcher ]	[ OCC::FolderWatcher::pathIsIgnored ]:	* Ignoring file "/Users/name/Nextcloud/EPFL/Prog/.DS_Store"
2021-10-14 10:23:04:779 [ info nextcloud.sync.accessmanager ]:	2 "" "https://nextcloud.name.ch/ocs/v2.php/apps/user_status/api/v1/user_status?format=json" has X-Request-ID "3a15bb3a-877f-4206-8eb0-a36b5cc89fda"
2021-10-14 10:23:04:780 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/ocs/v2.php/apps/user_status/api/v1/user_status?format=json") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYk6j3QZOxzR6w89LAfZrHabpcg4a8GIoH13dpK6USJ60JWVc5bUqWpKBt49msaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ab5d7e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:23:04:780 [ info nextcloud.sync.networkjob ]:	OCC::JsonApiJob created for "https://nextcloud.name.ch" + "/ocs/v2.php/apps/user_status/api/v1/user_status" "OCC::UserStatus"
2021-10-14 10:23:04:780 [ info nextcloud.sync.accessmanager ]:	2 "" "https://nextcloud.name.ch/ocs/v2.php/apps/notifications/api/v2/notifications?format=json" has X-Request-ID "015ad784-5d07-489e-8bd5-d97dd3bbb190"
2021-10-14 10:23:04:781 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/ocs/v2.php/apps/notifications/api/v2/notifications?format=json") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYk6j3QZOxzR6w89LAfZrHabpcg4a8GIoH13dpK6USJ60JWVc5bUqWpKBt49msaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ab5d7e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:23:04:781 [ info nextcloud.sync.networkjob ]:	OCC::JsonApiJob created for "https://nextcloud.name.ch" + "ocs/v2.php/apps/notifications/api/v2/notifications" "OCC::ServerNotificationHandler"
2021-10-14 10:23:04:781 [ info nextcloud.gui.folder.manager ]:	Etag poll timer timeout
2021-10-14 10:23:04:781 [ info nextcloud.gui.folder.manager ]:	Folders to sync: 1
2021-10-14 10:23:04:781 [ info nextcloud.gui.folder.manager ]:	Number of folders that don't use push notifications: 1
2021-10-14 10:23:04:781 [ info nextcloud.gui.folder.manager ]:	Run etag job on folder OCC::Folder(0x7fdfc4829400)
2021-10-14 10:23:04:781 [ info nextcloud.gui.folder.manager ]:	Can not run etag job: Polltime not reached
2021-10-14 10:23:05:029 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:23:05:030 [ info nextcloud.sync.networkjob.jsonapi ]:	JsonApiJob of QUrl("https://nextcloud.name.ch/ocs/v2.php/apps/user_status/api/v1/user_status?format=json") FINISHED WITH STATUS "OK"
2021-10-14 10:23:05:030 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::JsonApiJob finished for "/ocs/v2.php/apps/user_status/api/v1/user_status"
2021-10-14 10:23:05:221 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:23:05:221 [ info nextcloud.sync.networkjob.jsonapi ]:	JsonApiJob of QUrl("https://nextcloud.name.ch/ocs/v2.php/apps/notifications/api/v2/notifications?format=json") FINISHED WITH STATUS "OK"
2021-10-14 10:23:05:221 [ info nextcloud.gui.activity ]:	Clear the notifications
2021-10-14 10:23:05:221 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::JsonApiJob finished for "ocs/v2.php/apps/notifications/api/v2/notifications"
2021-10-14 10:23:09:781 [ info nextcloud.gui.activity ]:	Activity/Notification/Error successfully dismissed:  "Photos et films de famille/Films/DVD Famille/.DS_Store.nextcloud"
2021-10-14 10:23:09:781 [ info nextcloud.gui.activity ]:	Trying to remove Activity/Notification/Error from view... 
2021-10-14 10:23:09:781 [ info nextcloud.gui.activity ]:	Activity/Notification/Error successfully removed from the list.
2021-10-14 10:23:09:781 [ info nextcloud.gui.activity ]:	Updating Activity/Notification/Error view.
2021-10-14 10:23:14:779 [ info nextcloud.sync.accessmanager ]:	2 "" "https://nextcloud.name.ch/ocs/v1.php/cloud/user?format=json" has X-Request-ID "eeeb2f5b-cb57-42f2-addf-1b6edc63eff8"
2021-10-14 10:23:14:780 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/ocs/v1.php/cloud/user?format=json") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYk6j3QZOxzR6w89LAfZrHabpcg4a8GIoH13dpK6USJ60JWVc5bUqWpKBt49msaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ab5d7e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:23:14:780 [ info nextcloud.sync.networkjob ]:	OCC::JsonApiJob created for "https://nextcloud.name.ch" + "ocs/v1.php/cloud/user" "OCC::UserInfo"
2021-10-14 10:23:15:128 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:23:15:128 [ info nextcloud.sync.networkjob.jsonapi ]:	JsonApiJob of QUrl("https://nextcloud.name.ch/ocs/v1.php/cloud/user?format=json") FINISHED WITH STATUS "OK"
2021-10-14 10:23:15:128 [ info nextcloud.sync.accessmanager ]:	2 "" "https://nextcloud.name.ch/remote.php/dav/avatars/name/128.png" has X-Request-ID "434768c8-ee6a-4c22-b97f-78e3f0bfb0ab"
2021-10-14 10:23:15:128 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/remote.php/dav/avatars/name/128.png") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYk6j3QZOxzR6w89LAfZrHabpcg4a8GIoH13dpK6USJ60JWVc5bUqWpKBt49msaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ab5d7e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:23:15:129 [ info nextcloud.sync.networkjob ]:	OCC::AvatarJob created for "https://nextcloud.name.ch" + "" "OCC::UserInfo"
2021-10-14 10:23:15:129 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::JsonApiJob finished for "ocs/v1.php/cloud/user"
2021-10-14 10:23:15:378 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:23:15:379 [ debug nextcloud.sync.networkjob.avatar ]	[ OCC::AvatarJob::finished ]:	Retrieved Avatar pixmap!
2021-10-14 10:23:15:380 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::AvatarJob finished for ""
2021-10-14 10:23:25:781 [ debug nextcloud.sync.connectionvalidator ]	[ OCC::ConnectionValidator::checkAuthentication ]:	# Check whether authenticated propfind works.
2021-10-14 10:23:25:782 [ info nextcloud.sync.accessmanager ]:	6 "PROPFIND" "https://nextcloud.name.ch/remote.php/dav/files/name/" has X-Request-ID "9b3a93cd-f5d7-4b5b-b9db-c9bbc567124b"
2021-10-14 10:23:25:782 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYk6j3QZOxzR6w89LAfZrHabpcg4a8GIoH13dpK6USJ60JWVc5bUqWpKBt49msaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ab5d7e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:23:25:782 [ info nextcloud.sync.networkjob ]:	OCC::PropfindJob created for "https://nextcloud.name.ch" + "/" "OCC::ConnectionValidator"
2021-10-14 10:23:26:020 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:23:26:020 [ info nextcloud.sync.networkjob.propfind ]:	PROPFIND of QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") FINISHED WITH STATUS "OK"
2021-10-14 10:23:26:020 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::PropfindJob finished for "/"
2021-10-14 10:23:34:779 [ info nextcloud.gui.folder.manager ]:	Etag poll timer timeout
2021-10-14 10:23:34:779 [ info nextcloud.gui.folder.manager ]:	Folders to sync: 1
2021-10-14 10:23:34:780 [ info nextcloud.gui.folder.manager ]:	Number of folders that don't use push notifications: 1
2021-10-14 10:23:34:780 [ info nextcloud.gui.folder.manager ]:	Run etag job on folder OCC::Folder(0x7fdfc4829400)
2021-10-14 10:23:34:780 [ info nextcloud.gui.folder ]:	Trying to check "https://nextcloud.name.ch/remote.php/dav/files/name/" for changes via ETag check. (time since last sync: 43 s)
2021-10-14 10:23:34:780 [ debug nextcloud.gui.folder.manager ]	[ OCC::FolderMan::slotRunOneEtagJob ]:	Scheduling "https://nextcloud.name.ch/remote.php/dav/files/name/" to check remote ETag
2021-10-14 10:23:34:781 [ info nextcloud.sync.accessmanager ]:	6 "PROPFIND" "https://nextcloud.name.ch/remote.php/dav/files/name/" has X-Request-ID "d86ad8a2-2332-417c-ad0b-5b4277514564"
2021-10-14 10:23:34:781 [ debug nextcloud.sync.cookiejar ]	[ OCC::CookieJar::cookiesForUrl ]:	QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") requests: (QNetworkCookie("__Host-nc_sameSiteCookielax=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("__Host-nc_sameSiteCookiestrict=true; secure; HttpOnly; expires=Fri, 31-Dec-2100 23:59:59 GMT; domain=nextcloud.name.ch; path=/"), QNetworkCookie("oc_sessionPassphrase=%2BFDsIV8ffrukPYk6j3QZOxzR6w89LAfZrHabpcg4a8GIoH13dpK6USJ60JWVc5bUqWpKBt49msaoOYxwxwbZpJ6gjTUFQz4JT; secure; HttpOnly; domain=nextcloud.name.ch; path=/"), QNetworkCookie("ocyom4llzpko=eb0ab5d7e9; secure; HttpOnly; domain=nextcloud.name.ch; path=/"))
2021-10-14 10:23:34:781 [ info nextcloud.sync.networkjob ]:	OCC::RequestEtagJob created for "https://nextcloud.name.ch" + "/" "OCC::Folder"
2021-10-14 10:23:35:211 [ info nextcloud.sync.credentials.webflow ]:	request finished
2021-10-14 10:23:35:211 [ info nextcloud.sync.networkjob.etag ]:	Request Etag of QUrl("https://nextcloud.name.ch/remote.php/dav/files/name/") FINISHED WITH STATUS "OK"
2021-10-14 10:23:35:211 [ debug nextcloud.sync.networkjob ]	[ OCC::AbstractNetworkJob::slotFinished ]:	Network job OCC::RequestEtagJob finished for "/"

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'htaccess.RewriteBase' => '/',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'apps_paths' => 
  array (
    0 => 
    array (
      'path' => '/var/www/html/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 => 
    array (
      'path' => '/var/www/html/custom_apps',
      'url' => '/custom_apps',
      'writable' => true,
    ),
  ),
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => 'redis',
    'password' => '',
    'port' => 6379,
  ),
  'instanceid' => 'instance',
  'passwordsalt' => 'salt',
  'secret' => 'secret',
  'trusted_domains' => 
  array (
    0 => 'nextcloud.name.ch',
    1 => '192.168.*.*',
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '22.2.0.2',
  'overwrite.cli.url' => 'http://nextcloud.name.ch',
  'dbname' => 'nextcloud-db',
  'dbhost' => 'db:3306',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'installed' => true,
  'default_language' => 'fr',
  'default_locale' => 'fr_CH',
  'default_phone_region' => 'CH',
  'enable_previews' => true,
  'enabledPreviewProviders' => 
  array (
    0 => 'OC\\Preview\\PNG',
    1 => 'OC\\Preview\\JPEG',
    2 => 'OC\\Preview\\GIF',
    3 => 'OC\\Preview\\BMP',
    4 => 'OC\\Preview\\XBitmap',
    5 => 'OC\\Preview\\MP3',
    6 => 'OC\\Preview\\TXT',
    7 => 'OC\\Preview\\MarkDown',
    8 => 'OC\\Preview\\OpenDocument',
    9 => 'OC\\Preview\\Krita',
    10 => 'OC\\Preview\\SVG',
  ),
  'trusted_proxies' => 
  array (
    0 => 'proxy-adress',
  ),
  'loglevel' => 2,
  'maintenance' => false,
  'overwriteprotocol' => 'https',
);

Do you have any idea why it does that ?

I don’t know the client logs in details, so I might have missed something. If you are using the recent desktop client version, I’d perhaps try the bug tracker since there was no answer here.