Heading ice fishing yesterday I heard a strange humming noise from the radio. It was the kind of sound like you get while listening to a am station and going under power lines, but I was on FM. This evening we left the lake and now I have no volume at all on the radio, and when I go to the menu the audio control doesn't all you to do anything on the touch screen. I have the 730 radio in my truck. What do I do? Thanks