My M9 fires up and works just fine..........for a short while, somewhere between 5 and 15 minutes. All functions, buttons, controls work, but it just runs out of gas and becomes very very thin sounding. So much so that when I hear it doing that I just unplug it and go direct. I'm using a Line 6 power supply, not something aftermarket. Don't even know where to start, so I thought I'd ask around to see if anyone else has had this happen to them. I doubt it's worth putting in the shop at 90-100 per hour. Any thoughts?