This is not something that I've heard about before, so I'm not sure what the culprit might be. My first thought when hearing about an amp failure like that is wiring (particularly at the speakers), but the time between setup and event doesn't fit terribly well with that and the fact that the 1070's been hooked to the same cables and never blown up. You might want to give Outlaw support a call, though, just to see what they say.