my buds 07 roadglide did the same thing until it finally went out. HD replaced it three times and then of course the 4th time it did it, it was out of warranty. they gave him a card to a repair shop and told him good luck... What a crock for such an expensive POS radio to begin with.
Give these guys a call. Had work done a couple of years ago by them and they stand behind what they do. Talk with Tony who I believe is the owner, he might be able to tell you what the issue is over the phone. http://www.ironcrossaudio.com/
As mentioned, contact Iron Cross Audio. You'll be wasting your time talking to a HD tech or service manager--they know zip about the radio. ICA are former Harman Kardon service technicians who offer expert knowledge and great service.