OK, so I have a bit of a workaround for now --- how to deal with a frozen VM where no input is being accepted, and the VM clock is frozen. Assuming you have the frozen VM in front of you do the following: On the MacOS / Parallels menubar go to Actions Menu. Select "Reinstall Parallel Tools". Now, be patient ... maybe 30-60 to 90 seconds .... you may see an item popup on the dock -- ignore it. Eventually, you'll see an alert within the VM, telling you Parallel Tools have been installed --- it will offer "restart" or "Postpone". Choose POSTPONE ..... you should be able to continue to work in the VM. If you choose "Restart", Windows does indeed restart -- but back into the locked up state. Note if it happens again, you may need to force quit Parallels, and repeat, as once you choose "Postpone", the "Reinstall Parallel Tools" options is thereafter disabled.