How did you end up with the Library folder inside /volume1/Plex Movies? That is what is causing your system instability.
How did you update from DSM 6 to 7.2.2?
Did you follow the migration in the Plex FAQ (FAQ 27 - Migrating an existing PMS from DSM 6 to DSM 7)?
Did you install DSM 7.2.2 then create a new Plex Media Server, with new libraries, etc.?
Just trying to understand what happened, so we can help stabilize your system.
