I'm struggling to find the reason why my Ubuntu server hangs/crashes.

I have installed a barebone Ubuntu Server 20.04.2 LTS on my old computer to try and use it as a personal server to host some projects of mine.

My issue is after a few hours, sometimes as low as 2 to 3 hours or as long as 8 to 12, my server will eventually hang.

I get a visual output, but it is completely unresponsive to either keyboard, mouse or ssh. Sometimes it will log CPU #X stuck for Xs! but never seems to be coming from the same place. Sometimes kworkers, sometimes md-udev, sometimes systemd-networkd.
Other times I get just no visual output at all and just have to force a reboot.

So currently running on my server are:

• UFW


• OpenVPN


• Cockpit


• Portainer


• Docker container with nginx reverse proxy


• Let's encrypt docker container


• 2 Nextcloud docker containers


• around 5 other docker containers running small apps/web apps

What's puzzling me the most is I get not logs at all, I've checked my kernel and system logs and usually the last line is an unrelated UFW block command of some spammer ip address but nothing more substantial. I've also tried looking at /var/crash/ but same thing, either empty or the log of my reboot.

I've looked around this website and people usually seem to indicate this might be a hardware issue but I've never had an issue running this system overnight on Windows 10 when it was my main setup.

What I've tried:

• Multiple clean reinstall of Ubuntu Server 20.04.2


• Updated my BIOS and removed any overclock I might have applied


• Checked my temperatures and system load, both OK


• Checked my RAM with Memtest86 for 3x4 runs, totalling over 12 hours and got no errors

My system specifications are:

Ryzen 1700 @stock

16 GB CORSAIR GDDR4 @2133MHz but rated for 3200Mhz

MSI B350 Gaming PLUS MOBO

Gigabyte GTX 1080

Samsung 960 EVO 512GB nVme SSD 

650W corsair power supply

Plenty of cooling

If any of you has any lead or advice on how to diagnose my setup, or some more steps I could try I would be grateful.

Thanks for your help

EDIT 2021-03-03

After some more digging about ubuntu ryzen and freezes, I came across this thread on AMD forums. This suggests that there are issues with the C6 state on ryzen 1st gen. Their advice is to switch the power state in BIOS to Typical Current Idle which apparently has an impact on C6 state. I'll try that and see if anything changes.