Music on Mac switches unexpectedly.

Problem with Music on Mac. I have a Homepod in my Living Room and a minipod in my Kitchen. I have both of these pods selected in the popup airplay control in the Music app. When I select music to play it does play to both pods, but after 5-10 minutes it switches to the speakers attached to my Mac Studio. The airplay controls are still set to play to Living Room and Kitchen. I have to select Mac Studio in the control, then reselect Living Room and Kitchen and then the music plays fine for the rest of the day.

How can I fix this so it works correctly each time?