Mind you I live in the tropics & its probably hotter than most places, but my Stewart World 1.2 shut down again on me tonight towards the end of a very short set. It had shut down on me twice before due to heat & after the second time I added a clip on fan & I haven't had any problems since... until tonight. It was real hot on stage & I was running it at 4 ohms, but it was just one notch over 1/2 way up, so I wasn't even really pushing it. The sound from my cabs ceased, I turned around & saw the lights on the 1.2 were off. Too bad, its a great concept & actually sounds really good. But the third time shutdown was not a charm so I am done with this amp. If you live or tour in in a hot climate, I suggest you stay away from this amp.