Thanks for the log files.
First, what is the size and number of documents in /PlexMediaServer/AppData/tmp? With Plex Media Server stopped, right click on it in File Station & choose properties.
There have been a couple of reports of Plex not cleaning up after itself and leaving multiple TB of files in the tmp folder. A GB is no big deal. A TB means Plex is not cleaning up as it should.
I don’t believe that is your problem. Just double checking.
Second, and this is what appears to be the problem, Plex crashes when performing Intro Detection on one specific file:
/volume1/Plex/TV Shows/TheThreeStooges/Three Stooges Collection, The 1952-1954 - Disc 1_t00.mkv
This happened during Scheduled Tasks shortly after 2 a.m. on Aug 31, Sep 2, 3, & 4.
Can you move that file out of the library, to a location not visible to Plex scanners? Then scan the library and empty trash.
Then see if Plex makes it through the night.
If Plex crashes again, please pull a fresh set of log files.
Here are the log entries from Plex Media Server.1.log:
Plex is running Intro Detection during the maintenance window, proceeding through the Three Stooges files. It starts to analyze the problem file:
Sep 04, 2023 02:06:24.870 [140472367364920] DEBUG - IntroDetector: Initializing for "/volume1/Plex/TV Shows/TheThreeStooges/Three Stooges Collection, The 1952-1954 - Disc 1_t00.mkv" (2382)
Throws an error:
Sep 04, 2023 02:06:24.900 [140472367364920] ERROR - [Universal] MediaDecisionEngine could not find an appropriate remux or transcode target
Then CrashUploader runs and Plex Media Server stops:
Sep 04, 2023 02:06:25.169 [140472367364920] DEBUG - [JobRunner] Job running: /volume1/@appstore/PlexMediaServer/CrashUploader "--directory=/var/packages/PlexMediaServer/shares/PlexMediaServer/AppData/Plex Media Server/Crash Reports/1.32.6.7371-b6a09ad81" --version=1.32.6.7371-b6a09ad81 --platform=Linux "--platformVersion=DSM 7.2.64570-3" --serverUuid=637a15710c34d0befb9e303097e24dede5665bf4 --userId=hawk7@charter.net --sentryUrl=https://o17675.ingest.sentry.io/api/1233455/ --sentryKey=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx --vendor=Synology --model=x86_64 --device=DS1019+