in the last 2 days ive noticed my bass coming and going. i thought i might be putting the amp into protection mode but i havent been playing anything any louder than usual and the bass usually comes back within a minute or so. it'll be fine one minute then it'll disappear, then come back again. sometimes it'll come back if i raise the sub level on my eq. some people on another forum have suggested it might be a loose ground wire. im going into the shop tomorrow to have it looked at. anyone have any clues?