Server disappears (from network?) every few days, syslogs are clean.

[Mr.Khil]

Sorry,

I have this quite common issue I can see, but every reason seems to be different.
Every few days, randomly you suddenly cannot connect to server, dockers are down also without warning. Cannot SSH to it, cannot see it on network. Disks are not running, but the fans are. Hard reset is needed every time.
Syslog shows nothing (nchan process is just mobile application to check the array):
 

It started after boot USB started failing and I changed it for the smallest I could find 16gb, but still USB 3.0. There are no other failures.
I checked the hardware, PSU etc. Didnt do memcheck yet.
Not sure, should I try physically connect screen and keyboard to see if it is IP related, or does it really freezes without warning. Never had it before.

Edited October 19, 2023 by Mr.Khil
title typo

[JorgeB]

Post the diags, mostly to see the hardware used and if there are any known issues with it.

[Mr.Khil]

Ok.

xxx-diagnostics-20231019-1804.zip

[JorgeB]

No known issues that I'm aware of, one thing you can try is to boot the server in safe mode with all docker/VMs disabled, let it run as a basic NAS for a few days, if it still crashes it's likely a hardware problem, if it doesn't start turning on the other services one by one. 

[Mr.Khil]

Will do, no point of finding USB 2.0 device?

Edited October 19, 2023 by Mr.Khil

[JorgeB]

If it was a flash drive issue it would usually leave a trace in the syslog, but it may be worth trying.

[Mr.Khil]

Well it has 7 days uptime on USB2.0 now, color me suprised...