Server was suddenly down without any reason, manual startup went fine, logs?

Today I discovered my NAS was not running, without any reason.
(since it’s only an on-demand home-NAS, I didn’t notice right away).

Powered up manually and everyhing is fine. Now I want to find out what happened, but could not find any logs in the web UI.

What’s the best way to analyze this strange behavior?

I think it may have been due to overheating, the server’s front panel was obstructed.
Couldn’t find a heat graph in my TrueNAS SCALE 24.04.2 though…