I don’t use the Apple Home kit. I checked my Alexa routines, and nothing touches the Beams. I also have Control4 for lights & rooms, but that also doesn’t do anything to the bedroom or exercise Beam. I use an optical output from the TVs to get the sound to the Beams in both rooms.
I did the steps that you suggested, exactly as suggested, and the problem still existed.
I did call Sonos support at that point, and sent them various diagnostic snapshots. The tech had me create a temp group and add the exercise TV and an office speaker (unrelated to the Beam). He then had me test the exercise room, and the problem was solved. He then had me remove the unrelated speaker and delete the temp group, and that seemed to clear things out.
He said that the Sonos system was combining the 2 Beams for some reason based on something it was remembering, even though they had never been in a group, and no groups existed. Basically something was going on in the Sonos system that was not being reflected in the Sonos app. Kind of a phantom group.
So it seems to be working properly now. I provided the detailed troubleshooting in case someone else has this problem in the future. Thanks for all the help.