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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, 20.0.5): 20.0.8.1
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.10
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.46
PHP version (eg, 7.4): 7.4
The issue you are facing:
When sharing folders from a working instance of NC to my own I sometimes cannot open the shared folder.
The remote NC is working fine for everyone else, just my instance seem to be broken.
“sometimes” meaning when I share a single file it works just fine. When sharing folders < 600 MB I sometimes get a “Storage temporarily unavailable” while accessing the share on my instance. Also one folder containing 1.8 GB does not work at all.
Error also occures when sharing from other working instances.
(edit: I’m running behind a reverse proxy if that matters, but all https traffic goes through to NC and everything else works fine so that should not be the problem.)
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- Setup up a new instance of NC 20.0.8
- share folder from known working instance to the new one
- access shared folder on new instance
- a) get “Storage temporarily unavailable” error only sometimes
- b) have normal working share sometimes
The output of your Nextcloud log in Admin > Logging:
{"reqId":"FWSNrZLrTi2JP4HLtFoH","level":4,"time":"2021-03-07T19:13:29+00:00","remoteAddr":"fd01::64","user":"***","app":"webdav","method":"PROPFIND","url":"/remote.php/dav/files/***/***folder***","message":{"Exception":"Sabre\\DAV\\Exception\\ServiceUnavailable","Message":"","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php","line":80,"function":"getChild","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":976,"function":"getNodeForPath","class":"Sabre\\DAV\\Tree","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1678,"function":"getPropertiesIteratorForPath","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1661,"function":"writeMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":363,"function":"generateMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPropFind","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":251,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":319,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":332,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":167,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php","Line":225,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.72 Safari/537.36","version":"20.0.8.1","id":"604525d94bbef"}
{"reqId":"FWSNrZLrTi2JP4HLtFoH","level":4,"time":"2021-03-07T19:13:29+00:00","remoteAddr":"fd01::64","user":"***","app":"webdav","method":"PROPFIND","url":"/remote.php/dav/files/***/***folder***","message":{"Exception":"Sabre\\DAV\\Exception\\ServiceUnavailable","Message":"","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Tree.php","line":80,"function":"getChild","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":976,"function":"getNodeForPath","class":"Sabre\\DAV\\Tree","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1678,"function":"getPropertiesIteratorForPath","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1661,"function":"writeMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":363,"function":"generateMultiStatus","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPropFind","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":251,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":319,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":332,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":167,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php","Line":225,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.72 Safari/537.36","version":"20.0.8.1","id":"604525d94bbef"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => '***',
'passwordsalt' => '***',
'secret' => '***',
'trusted_domains' =>
array (
0 => 'some.domain.tld',
),
'datadirectory' => '/var/nc_data',
'dbtype' => 'pgsql',
'version' => '20.0.8.1',
'overwrite.cli.url' => 'https://some.domain.tld',
'htaccess.RewriteBase' => '/',
'overwriteprotocol' => 'https',
'trusted_proxies' =>
array (
0 => '[fd01::69]',
1 => '[fd01::64]',
),
'dbname' => '***',
'dbhost' => '***',
'dbport' => '***',
'dbtableprefix' => 'oc_',
'dbuser' => '***',
'dbpassword' => '***',
'installed' => true,
'ldapIgnoreNamingRules' => false,
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'memcache.local' => '\OC\Memcache\APCu',
);