Whilst I should probably shut up as we’re moving But some supplemental information on this. As part of the migration, I revoked 5 pilot users access to some group and shared folders last night as those have been migrated. This morning Nextcloud has crashed for all of them, causing incredibly slow file access to everything and the folders are still visible in their NC folder.
I’m having to remote access each computer individually, stop the Nextcloud process, manually delete the removed folders and start again. The first one had upgraded Nextcloud client 3.12.1 so that clearly hasn’t helped.
I’m pretty sure now that the problem is bulk operations like this - the thing that triggered this entire post was deleting a large number of documents from a group folder.
Plus it’s certainly a new problem. This client had been using Nextcloud quite happily for 2+ years. My fault for upgrading!