I've recently started running into a strange issue with Ubuntu 22.04 (x64), can't quite understand what's going on. It's a (kinda) old computer that's a temporary solution for Discord bot hosting, which means it runs 24/7. It appears that after 16-20 hours of hosting the bots, Ubuntu suddenly dies, even though the PC doesn't stop running. As "dies", I mean that nothing gets outputted to the screen, any actions except for the power button press are completely unresponsive, and the keyboard/mouse lights are dead, too. It definitely is not stuck being unresponsive, otherwise it'd respond to REISUB or something.
After a restart the system successfully booted, and I thought it was a short power outage that caused this. The problem reappeared today. I checked /var/log/syslog. There are no crashes / fatals / kernel panics, but it seems like there were no logs after 2:27 AM (which might be the time of death for my Ubuntu today). After that, I thought that BIOS diagnostics might show me that something was wrong. Unfortunately, nothing.
The PC has a dual-core Intel Pentium E6800 (3.33 GHz) with 4GB of DDR3 RAM, an Nvidia GT230, and 2 HDDs (with the system sitting on the 512GB one).
Typically the CPU runs at 40°C, around 30%. RAM usage doesn't go above 2.8GB. Googled this, and sadly it seems like I'm the only one with this issue who decided to post (or am I?).
Does anyone have any idea what's happening with my PC? Should I simply shut it down and wait till the factory-new one is ready? Or is it a system/hardware failure that is possible to resolve? Any help is appreciated!
EDIT: The same happened again, seems like it's a hardware issue and is not an Ubuntu bug. Based on other diagnostics, the PC gets stuck in an error loop whenever this issue occurs. I'll see what else I can find out.
