I have a 2005 special edition Mazda 3 with Bose stereo. Haven't had any problems with it until just recently the sound stopped coming through the speakers. Every once in a while sound will come through for like 5 seconds and then quit again, no crackling, just on or off. The CD player & radio still register as if they're working (can switch tracks & channels) just no sound will come through. Any ideas before I pay a nut to take it to the dealer??? THANK YOU IN ADVANCE