hey guys im new to the fourm but have been lurking for awhile. I have a Trace Elliot AH250 with the GP12 SMX pre and im pretty shur that its pre gibson. the problem ive been haveing is that after a undetermend amount of time (usely late in the 3rd set or 4th set of a gig) the amp shuts down, all the lamps are still lit but no sound but if i turn it off and turn it back on it works again but just for a little while then it does it again. i think it might be overheating and shuting down. i have checked the fan and it seems to be working and nothing is clogged up with dust and **** so im wondering if any one here has any ideas on how to fix this or what might be causeing the problem.