Ok, I have an issue that I hope someone on this thread can help with. I recently aquired a Mesa M6, and absolutely love the amp. I run it thru a new Mesa 810 4 ohm with the ohmage on the head matched up. Well, I was playing last weekend in my cover band, and halfway thru the first set, it just shuts off. I checked it and it was not hot, warm, but nothing out of the ordinary. It would not turn back on for 5 minutes, and when it did, it played for another 15 minutes and off again, this time it wouldnt come back on untill the last set (I just ran the direct out of my sansamp when in crapped out the first time). I had the active switch on, the gain at 9 0clock, pretty flat EQ on head and bass, and the master was never past 12 oclock. I didnt think i was pushing it hard at all, the fuse is fine, but i wasnt running with a power conditioner, which leads me to think that it could have been bad power. Was there ever an issue with this amp acting this way? Im not sure if it has been back to Mesa for the upgrades everyone talks about, which im still not sure what those are. Can anyone help?