How to investigate sudden shutdown?

[Tobias Diekershoff <tobias.diekershoff@gmx.net>]

Hey everyone,

perhaps someone of you can help me with tool / log file I have not investigated
so far. I have a Thinkpad with Debian Bullseye on it, running KDE/Plasma as main
desktop environment and from time to time it just turn off without prior
indication to do so.

It it not particular warm before and journalctl / dmsg logs are looking
unsuspicious around these sudden shutdowns for me.

Any pointer what else could be investigated (and I do realize that these are
very vague symptoms) would be appreciated!

Thanks for reading, have a nice day!
  Tobias

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