The qr code is just the link i posted. I took a quick look and it doesnt seem like it. As far as i can tell its just some low level hardware info. It’s also pretty short. Not 100% sure though.

Thank you very much for your help so far, I will test the different methods and settings suggested in this thread over the next few weeks. I probably won’t find the time or motivation to methodically figure out the specific issue. That means that if at some point my system seems stable again, I will just leave everything as is and try to just be happy about it.

But when my life gets less busy I’ll maybe have time to see this completely through.

Anyways thanks to everyone, especially you, for taking the time to help me. I will update this post should I ever figure it out.

Well I’ve not fixed anything yet😅. It was sadly just a hypothetical. Sorry if that wasn’t clear from the comment.

Yes, I went to fast because I have been sitting on this for months now. Normally I would only change one thing at a time, but with this situation it can take everywhere from 5 minutes to multiple days to test one single thing. If it doesn’t crash for 48 hours, it might be because I fixed the issues, or it might just be a coincidence and it will crash in hour 49 ¯_(ツ)_/¯.

But your right, I will attempt it the right way when I find the time, even though it will probably take weeks 😮‍💨.

And in comparison to Windows, the qr code actually contains useful information!

Thanks, please check my updated post. I have disabled the relevant setting in my BIOS, installed cpupower and increased the idle state to the maximum value of 2. I have also tried states 0 & 1. Do I need to run the machine for longer or should it have crashed right away according to your hypothesis? I also can’t tell you if the BIOS setting already fixed my issue since I still can’t reproduce it.

About your last paragraph, the system has had these issues mostly while idle, but that’s probably because my system is running idle most of time anyways. I have also had the issue during low to medium loads, like transcoding audio via jellyfin. But I haven’t methodically run a process on all cpus. How would I go about running a load that uses all cores? I don’t particularly want to run a stress test for hours (because loud), but at this time I’m really open to trying anything.

I have also enabled an option in my BIOS that generates a dummy load some time ago, because some forum post had suggested a PSU issue is at fault for unexplained reboots. I have a 500W PSU that is way overkill for my components, and some users suggested that some PSU’s can turn of when the load is to low. The option did not fix my problem. I have since connected a weaker 220W PSU, which also didn’t help.

Thanks, I already ran memtest86+ multiple times and it passed every time. But another comment said that they had a similar issue where RAM was indeed the problem but memtest showed no errors. I will try removing one stick of memory to further rule out faulty RAM.

Thanks. I have run memtests and they all passed, so I thought I ruled out the RAM. Now I will try your suggestion. It will likely take me several days to come to any conclusion because I need to try changing only one thing and then hoping it stops happening, but I will only know for sure if the server has been running for, say, more than a week straight.

Thanks. I have not been actively keeping an eye on the temps, but I had already suspected an overheating issue, so I once ran a 15 Minute stress test with temps never reaching beyond 60°C. Also because the machine is so unreliable it has been running idle for most of the time (archinstall standard with no addional packages installed.) So I thought I ruled this out, but I will look into running grafana and/or Prometheus.

Thanks. I have already tried the first three steps, and the same drives worked fine in another machine so i don’t think the drive is at fault.

About the GPU im pretty sure the issue also happens before I connected the gpu.

About simulating the workload:

Because of these issues, i am not currently running anything of importance on this machine and it mostly idles. The sudden reboots don’t seem to be affected by workload.

It’s of course also possible that this is a completely seperate issue, but I would still like some tips. Please help me because I am about to buy an entirely new PC because this has been driving me nuts!!