when you unplug Android Auto or Apple CarPlay as your Source, the Incontrol rolls over to the next Source. Radio (AM/FM) is usually the next source. If you have an AM station as a pre-set, it will usually default to the last station you were on when you last listened to the radio or the first pre-set. Not sure why the sound level would be so much higher. If you haven't set a pre-set for AM, perhaps you can find an acceptable FM station to listen to and set it as a one of your favorites. See if that solves the problem.