I was going down the road and had my HU turned up just enough to hear the music and then the sound went off. Everything was still playing, but I had no sound. I pulled out the radio and everything is still hooked up the way it should so I put it back in and as I was going back home I hit a little bump in the raod and it started coming on then back off. It started doing that every bump I hit. Then it just stopped. Can anyone tell me what might be the problem? I figure some kind of short inside the HU.