ok so my amps cut in and out lately (2 alpine m500) but they would always come back on before i got home to do the rca test with 3.5 mm jack to the ipod to check if it was the amps. and they cut out tonight but this time i was able to do the test and the sub didn't play i turned the amps off then turned them back on and it worked for like 3 secs and cut off again.. any ideas? help?! really hope that the amps are broken.... and i know its not thermal cause the amps were cool not warm when they cut out....