Hopping in here with a similar problem.
Unraid Plus
Ryzen 3700x
x570x gaming MB
32GB
Win 11 VM- 16GB, 4 cores/8 threads.
Currently has an nvidia GTX 1050, used to have an AMD 7850.
I do have PCI ACS override enabled for IOMMU separation (annoying, necessary)
Reproducible problem:
If the system is in active use, it runs flawlessly, no timelimit.
If the nobody is using it, it will freeze after 10 minutes with all cores/threads pinned to 100% (as per unraid dashboard).
I've disabled all power management, disabled screen savers, removed hardware (I thought maybe bluetooth mouse was sleeping/causing a problem).
Windows logs showed Radeon software failing repeatedly, so I was optimistic that was the problem. uninstalled, and persists.
Freezing with version 22000.376.0
I'll try the suggestion to join the insider and will report back.
Edit: forgot to add that this VM can also run as bare-metal and the issue is not present in that state.