I did all of these exact things back in Feb.. BIOS, re-pasted the CPU, replaced the RAM (but with 64GB
TeamGroup). I even
strapped a giant fan on the side...
I am running an LSI SAS 9300-8e in the PCI slot with 120TB of disk, all on top of bog-standard ubuntu server. Its core workload is largely relegated purely as a NAS at this point due to reliability issues.
Almost like clockwork.. once every 7ish to 10 days or so, the entire system just halts and requires a hard, physical reboot. Logs dont point to any smoking guns. It's so consistent, my solution so far has been to connect the thing to a smart plug, and use Home Assistant to check the server for heartbeats, and when they stop, it hard powers down the server and powers it back up via that smart plug.
So I've just been on the hunt for a small server replacement option with 10gb ever since and have just written off MinisForum for the future.