I seemed to have fixed the problem, at least for the time being. The TV I have the problem with has 720p resolution. I went through the following procedures with my Roku Express 4K+. Go to:
- Display types
- Turn off Automation resolution (1080p) to manual
- Change to 720p in my case or to whatever resolution your TV is.
So far, so good. No freezing with audio when a show changes to a commercial.