I’d check if you are affected by the DB bloat issue. It cannot hurt to try and run the DB bloat issue fix, followed by repairing the database using this bat file: DBRepair/Windows at master · ChuckPa/DBRepair · GitHub
As an immediate measure, stop Plex server, then enter the plex data folder,
dive into the subfolder \Plex Media Server\Cache\PhotoTranscoder,
and empty it out.
This may provide some wiggle room to perform the above repairs.
