Has anyone had any problems with these? My cd player stopped working today, So I put another one in, which happens to be the same exact type, kenwood excelon x817, brand new, It played fine for a while and it went out to, all in the same day. All my car"s wiring and fuses are fine, one cd player is on warranty, the other one is not. What could be happening here? they just stopped working all of a sudden.