This morning I went for a drive and had no sound from the radio and couldn't select source. It was on just no sound and it wouldn't let me select the radio tuner. The button worked and the display would try to change then revert to AUX. I got some breakfast and when I came back out to the car after about 45 minutes the radio worked like nothing was ever wrong. Is it just a minor glitch or should I have the dealer check it out?