Collections/Playlist management

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So the scheduled tasks are set up by default. Look at Dashboard > Scheduled Tasks (at the bottom). Scroll down to the Maintenance section and you'll see "Clean up collections and playlists". The default is to run this at application startup. You can remove that trigger. Network attached storage can create a race condition between Jellyfin boot and network storage existence. Worst case scenario is that it removes your libraries because it can't see the media. Playlists is a small impact of that sort of issue.

   

The log lines you posted indicate the issue may be due to a) a plugin or b) triggered by library scanning. Again, you can find the latter in Scheduled Tasks (see screenshot). For the former, check your installed plugins and share which plugins you have installed.