This happened to me. At first the radio would cut in after 5-10min into the drive. It did this about 5 times now just nothing. I checked the fuses, I tried to reboot it by disconnecting battery. I just bought a second car for the wife so money is tight now and would rather fix than replace. Someplace I saw a pin readout chart for the HK amp so it looks like my next step is to bust out the multi-meter, pull the passenger seat and check the pins.