I have a 2003 S with the HK audio system and my AM reception will drop out and come back sometimes. It is like the signal drifts out then back in. Also sometimes when I hit a bump the AM signal is lost and if I hit the side of the console near the radio it will come back again. There are no issues with FM reception at all or any CD or changer issues. Anyone have info about this issue, is headunit bad, can it be repaired, or should I look into another headunit.

Thanks