Not to re-open a dead thread, but I am experiencing this exact behavior. The difference is I am using a Windows 11 VM and am on a Dell R530 platform, dual xeons and whatnot. Weird thing is everything was working until the other night when I powered off the server and turned it back on. Now whenever I try and start the VM the entire web ui crashes. Then if I SSH into the server and send a reboot command SSH hangs and does nothing. The only way I can recover control is to hard power down and reboot. I am passing through only a P620 GPU to this vm otherwise its all virtual hardware.