I ran into an "Out of Memory" error notification around 4:40 AM by the Fix Common Problems plugin, and am unsure what the root cause is. I previously ran into this error a few days ago around the same time, but was unable to capture log files due to not having a log server set up at the time. I've attached the logs, and any help in identifying what is leading to the issue would be very much appreciated.

Thank you.nas-diagnostics-20260926-0752.zip

Edited September 26Sep 26 by Oublieux

Your logs show three out-of-memory events where the kernel stopped Plex Transcoder:

- September 25 at 06:05:39

- September 26 at 00:20:24

- September 26 at 06:55:04

These are the server’s log times. Each time, that single process used approximately 11.1–11.7 GiB of your 16 GiB RAM.

Check what Plex was anything playing at those times, if there was no playback, check your scheduled maintenance settings. Plex can generate video preview thumbnails during scheduled maintenance, though these logs do not confirm that task caused the problem.

As an isolation test, temporarily stop Plex overnight when it is not needed and check for new out-of-memory events. An existing warning can still refer to the earlier failures. If another event occurs, collect fresh diagnostics before rebooting.

Thank you @JorgeB . Nothing is indeed playing at that time, but it occurred to me that I added a Music library for the first time a few days ago, and also enabled "Sonic Analysis". This is being run as one of the scheduled tasks from 12 AM - 6 AM, and I believe this is what is hording the RAM. I'm going to be testing if I still get this error over the next few days after disabling "Sonic Analysis". I appreciate the help!

Confirming that Sonic Analysis was the culprit. I’ve read that it’s heavy on CPU so the RAM usage being high is curious. I’ll be looking into Plex logs to further narrow down the issue, but in the meantime, this was the reason for the OOM.