My Kenwood radio started going into protect mode. I have it going to a Rockford pbr300x4 with rca cables out to 4 Rockford 4 ohm speakers. cant find anything wrong with speakers and amp is not going into protect mode. so I took the Kenwood out and put the stock radio back in and switched the amp input from 4 channel to 2 this is wired high input in from the stock radio and I have had no problems. Has anyone had any problems with the Kenwood radio?