Nov 16 22:05:14 LibreELEC dcb104c3506c[1344]: [Info] SonarrBootstrapper: Starting Web Server
^ Users running Sonarr are probably running other apps to download of content from torrent networks. Running piracy crapware on your LE install will a) result in no support in this forum (you can run what you like, but we don't support pirates) and b) it's almostly certainly the cause of your "system degrades to the point where it's unusable" problem. Just look at all the errors being spewed into the journal.
Solution A: Remove the background crapware and run the OS as it was intended and it won't degrade
Solution B: Run another distro and become someone else's problem
If you're not a pirate and want support to continue: prove it with clean logs and configuration examples.