at start up the audio system works perfect. but that only lasts for about 2 min. then the speakers cut out. the head unit says it is playing and i can switch back and forth between all the functions, i tried resetting the audio levels to the factory settings. still nothing. turn ignition on and off and still no sound. only after a long period of time will the sound return, as if it re sets itself, but that only lasts for about two min then nothing. i'm thinking it has to do with the amp but unsure how to check it. Anyone had or having similar issues?