Alright, heres what it is doing, with all my bass guitars as well so i know its not the bass. The volume level drops and sounds like the head has turned itself off. The amp light is still on, and when i unplug the bass cable and plug it back in it kicks back on like nothing happened. Im baffled and my local shop i always go to doesnt know as well. They have a amp head specialist that does amazing work, but im trying to figure out if its going to cost me an arm and a leg to repair first. I have it plugged into a 4 ohm ashdown abm 414t 4x10. I know its not that because it acts the same way when i plug it into my 8 ohm 1980 fender bassman 115. If anyone has any clue id greatly appreciate it! thanks!