kicker kx300.4

got kind of a strange problem i have the protection light on the channels are labeled as amp 1 and amp 2 amp 1 works amp 2 does not but when i turn off the switch powering the remote power it will work for a second or two same when i flick it to on sound will come out briefly then stop and if i do the same on amp 1 it seems to get louder like more power but will still continue to function im thinking maybe a capacitor problem but really i have no idea where to start to track down the fault