Thanks for the response Gary.
I tried your suggestions, and many, many other things, before finally looking at the commands in VA. I found a few did not have a release at the end of the command so the key was being held down and stopping everything. Though I had looked at the commands before I didn’t notice the problem and it was only on a few.
VA is working beautifully now and what a joy not to have to use the keyboard in VR.