ok, some time last week my friend took my cable out (which is one of those planet waves that has to be plugged in a certain way) to tune his guitar. when he put it back he put the end that should go to the speaker in my bass. i played with it like that for a few hours because i didn't know he switched it. and then my amp started cutting out and then coming back on. then i noticed it, and turned my cable back around. but now every once in a while my amp will start cutting out again and the volume generally doesn't sound as loud. at first, i thought the cable was messed up, but then i tried another cable and it did the same thing. so i know my amp has to be messed up. any suggestions or ideas? thanks.