OctoPi disconnected, not responding : FROZEN

Hi everyone ! Need your lights !

What is the problem?

Randomly, without printing, the WIFI connection is lost. Cannot connect via RJ45. Via the installed OctoDash touch screen, no reaction (usually, pressing the screen wakes up the printer and turns it on via a relay).

Last event dated today at 3:48 p.m. (= loss of Tailscale VPN connection)

What did you already try to solve it?

Change of the MicroSD card by a new one with a new installation of OctoPi / Octoprint.

Systeminfo Bundle

octoprint-systeminfo-20211116201904.zip (255.5 KB)

Additional information about your setup

Attached Octoprint.log and syslog.log
In both log files, no event after 3:26 p.m. Manual restart (electrical switch of the Raspberry power supply) at 8:00 p.m.
And nothing for 4 and a half hours ... What do you think? Are there maybe other logs that I could extract for analysis?
octoprint.log (3.0 MB)
syslog.log (3.9 MB)

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