Had Parallels run fine for a long while. Using Parallels 15.1.0. Just upgraded the Mac to Catalina. Since this, I've twice had a complete hang of the VM. Freezes. No mouse response or keyboard response. Try to shutdown, doesn't work. Then try 'stop' and that also hangs. Only way to recover is to use Mac activity monitor and force quit the VM. Then goes a day or more without issues. Anyone else seeing similar issues?.