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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
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Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 13.0.4
Operating system and version (eg, Ubuntu 17.04): Ubuntu 16.0.4 (cloudron)
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.18
PHP version (eg, 7.1): 7.0.30
The issue you are facing:
Nextcloud Windows client (2.3.3) periodically stops syncing, displays under account: “No connection to Nextcloud at Operation canceled”.
If I remove the account and re-add it, it still doesn’t work unless if I skip the folders configuration. While adding the account, if I select “Choose what to sync” and wait 20-30 seconds for the remote folders to appear, then cancel out and skip the folder configuration, it will work and I can then manually add the folders to sync. The message will now display as "Connected to as ".
If I get it working and either reboot or close/re-open the sync app, it again displays the no connection message and stops syncing.
Is this the first time you’ve seen this error? (Y/N): N - it happens regularly
Steps to replicate it:
- Close and re-open sync app
The output of your Nextcloud log in Admin > Logging:
{"reqId":"jnuE5qzm3thYkDHyHlqk","level":3,"time":"2018-07-27T12:27:04+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files, file: index.php\/css\/files\/4fda-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"jnuE5qzm3thYkDHyHlqk","level":3,"time":"2018-07-27T12:27:04+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_trashbin, file: index.php\/css\/files_trashbin\/1980-e948-trash.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"jnuE5qzm3thYkDHyHlqk","level":3,"time":"2018-07-27T12:27:04+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/comments, file: index.php\/css\/comments\/1980-e948-autocomplete.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"jnuE5qzm3thYkDHyHlqk","level":3,"time":"2018-07-27T12:27:04+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_sharing, file: index.php\/css\/files_sharing\/35c3-e948-mergedAdditionalStyles.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"jnuE5qzm3thYkDHyHlqk","level":3,"time":"2018-07-27T12:27:04+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_texteditor, file: index.php\/css\/files_texteditor\/21f4-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"A67ek7z3c0EZrtu5U1qR","level":3,"time":"2018-07-27T12:43:20+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files, file: index.php\/css\/files\/4fda-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"A67ek7z3c0EZrtu5U1qR","level":3,"time":"2018-07-27T12:43:20+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_trashbin, file: index.php\/css\/files_trashbin\/1980-e948-trash.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"A67ek7z3c0EZrtu5U1qR","level":3,"time":"2018-07-27T12:43:20+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/comments, file: index.php\/css\/comments\/1980-e948-autocomplete.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"A67ek7z3c0EZrtu5U1qR","level":3,"time":"2018-07-27T12:43:20+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_sharing, file: index.php\/css\/files_sharing\/35c3-e948-mergedAdditionalStyles.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"A67ek7z3c0EZrtu5U1qR","level":3,"time":"2018-07-27T12:43:20+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_texteditor, file: index.php\/css\/files_texteditor\/21f4-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"YGjprXTZs6xqEzncgbg1","level":3,"time":"2018-07-27T12:49:51+00:00","remoteAddr":"172.18.0.1","user":"385D330A-7516-44DC-B7A6-F81605325834","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files, file: index.php\/css\/files\/4fda-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"YGjprXTZs6xqEzncgbg1","level":3,"time":"2018-07-27T12:49:51+00:00","remoteAddr":"172.18.0.1","user":"385D330A-7516-44DC-B7A6-F81605325834","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_trashbin, file: index.php\/css\/files_trashbin\/1980-e948-trash.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"YGjprXTZs6xqEzncgbg1","level":3,"time":"2018-07-27T12:49:51+00:00","remoteAddr":"172.18.0.1","user":"385D330A-7516-44DC-B7A6-F81605325834","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/comments, file: index.php\/css\/comments\/1980-e948-autocomplete.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"YGjprXTZs6xqEzncgbg1","level":3,"time":"2018-07-27T12:49:51+00:00","remoteAddr":"172.18.0.1","user":"385D330A-7516-44DC-B7A6-F81605325834","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_sharing, file: index.php\/css\/files_sharing\/35c3-e948-mergedAdditionalStyles.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"YGjprXTZs6xqEzncgbg1","level":3,"time":"2018-07-27T12:49:51+00:00","remoteAddr":"172.18.0.1","user":"385D330A-7516-44DC-B7A6-F81605325834","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_texteditor, file: index.php\/css\/files_texteditor\/21f4-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"0KkKstekyeLFShj288zQ","level":3,"time":"2018-07-27T12:58:48+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files, file: index.php\/css\/files\/4fda-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"0KkKstekyeLFShj288zQ","level":3,"time":"2018-07-27T12:58:48+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_trashbin, file: index.php\/css\/files_trashbin\/1980-e948-trash.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"0KkKstekyeLFShj288zQ","level":3,"time":"2018-07-27T12:58:48+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/comments, file: index.php\/css\/comments\/1980-e948-autocomplete.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"0KkKstekyeLFShj288zQ","level":3,"time":"2018-07-27T12:58:48+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_sharing, file: index.php\/css\/files_sharing\/35c3-e948-mergedAdditionalStyles.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"0KkKstekyeLFShj288zQ","level":3,"time":"2018-07-27T12:58:48+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_texteditor, file: index.php\/css\/files_texteditor\/21f4-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"a6KISiLm6S4PrgCkq4KW","level":3,"time":"2018-07-27T14:17:35+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files, file: index.php\/css\/files\/4fda-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"a6KISiLm6S4PrgCkq4KW","level":3,"time":"2018-07-27T14:17:35+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_trashbin, file: index.php\/css\/files_trashbin\/1980-e948-trash.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"a6KISiLm6S4PrgCkq4KW","level":3,"time":"2018-07-27T14:17:35+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/comments, file: index.php\/css\/comments\/1980-e948-autocomplete.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"a6KISiLm6S4PrgCkq4KW","level":3,"time":"2018-07-27T14:17:35+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_sharing, file: index.php\/css\/files_sharing\/35c3-e948-mergedAdditionalStyles.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
{"reqId":"a6KISiLm6S4PrgCkq4KW","level":3,"time":"2018-07-27T14:17:35+00:00","remoteAddr":"172.18.0.1","user":"admin","app":"lib","method":"GET","url":"\/index.php\/apps\/files\/","message":"ResourceLocator can not find a web root (root: \/app\/data\/apps\/files_texteditor, file: index.php\/css\/files_texteditor\/21f4-e948-merged.css, webRoot: , throw: true)","userAgent":"Mozilla\/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit\/537.36 (KHTML, like Gecko) Chrome\/67.0.3396.99 Safari\/537.36","version":"13.0.4.0"}
I'm pretty new at this and can't figure out the other log files... I set this up through Cloudron. any help is much appreciated!