Two days ago my husband and I were driving the car and of course we use the radio all of the time. Randomly the volume went up and down a few times within 5 minutes. We could see the volume level go up and down on the display screen. Nobody was touching the volume knob nor the steering wheel volume control. Luckily, it only went up 2 levels so it wasn't too terribly loud but who knows if it happens again and will go way high!