Yes that is identical to my experience. I have received a reply from Support, who have advised to try all the things that I have done already, and if that does not work then to reinstall Parallels. Reinstallation is perhaps not as bad as it sounds because you do not lose the virtual machine. Might look into this at some point, however for the time being I have actually been finding that using my MacBook Pro 16 inch M1 Pro without a USB microphone is actually pretty good. The built-in microphone is of studio quality and I have been getting very accurate results. I have used voice recognition for over 20 years , and we have always been told that we must use an external microphone, but perhaps for the sake of reliability this is the way to go. Certainly makes the set up much more portable. I fully appreciate that if you use an external monitor, this might complicate things a little bit although perhaps not to be a dealbreaker.