After upgrading from a HP Micro server gen 8 to an Asrock B550M steel legend motherboard with a Ryzen 7 3600X and 64GB of ECC memory my server was crashing all the time, totally unusable, I could even a reboot by scanning the library in jellybean so I tried all the fixes and work around's such as:
1, Disable C states in Bios
2, Set the power supply idle control setting to: typical current idle
3, Opened a command prompt, cd'd to the /usr/local/sbin/directory and ran the zenstates --c6-disable command to disable C6
Nothing worked, the fix for me was to downgrade Unraid from v 6.12.3 to 6.12.2
I left all the work around's in place but that seems to have resolved the issue
This also worked with a Ryzen 5 650G Pro CPU on the same motherboard