A few days ago I was driving down the road, and my HU just started flashing on/off repetedly. Sometimes it would make it as far as telling me what mode the cd player is in, then it would flash back off. Then a day later it would just start making this really high schreeching noise. When I get it to work, it does this both playing the radio and CDs. Whats up with my HU? BTW its a JVC(dont remember the model#) and its about 3 years old.