Hello everybody,
now that I have built myself a pikvm to remotely control the system completely, I could also find a solution to my problem.
I have tested some settings in these months and noted for me where there was a problem and where not. After I have now found my optimal settings and tested for weeks with success, I can now close the topic.
Power Supply Idle = Typical Current Idle
PSS Support = deactivated
Global C-States = deactivated
Core Performance Boost (CPB) = deactivated
I used these settings before and after a BIOS upgrade without crashes. In the meantime I also changed the USB stick (fresh install) and formatted the hard disks. Therefore I strongly assume that it is not a setting on the operating system but only the BIOS.
P2.20 -> P2.30 (B550 Taichi)
The only thing that doesn't work and won't is hibernating a VM. With Global C-States enabled (if I remember correctly) I could wake up VMs from hibernation. Since I had stability issues with that option as well, I had to disable that and when the VM is in hibernation I can't wake it up and have to do "force shutdown". Therefore set in the operating system that hibernation is disabled.
I hope this info is helpful for one or the other. I am so relieved to have solved the problem now.