Speculating here, but I suspect that it's an app in the "background" that is causing the issue. As much as I like Sonos, it exhibits bad behavior with its back

Speculating here, but I suspect that it's an app in the "background" that is causing the issue. As much as I like Sonos, it exhibits bad behavior with its background task that requests priority audio. If I have the app even running (even in the background, but haven't force quit it), it will interrupt the stereo in my car if I'm trying to listen to terrestrial radio and keep forcing CarPlay to open until I force quit the app.