I have a koss head unit and it has worked for about two years now until just recently it blew a fuse. I changed the fuse and it just blew again. i checked for bare wires and found a crack in the power wire. I taped it up and the head unit worked for about five minutes then the fuse blew again. Once again I checked for bare wires and couldnt find any. I have replaced the fuse again and took the head unit out of the dash and made sure no wires were touching each other just in case i missed something and it works for about five minutes then blows. anyone know whats wrong?