I'm running stable for almost two weeks, without any problems what so ever on 137000 voltage and on 1375 MHz, with smartreflex on.
Also my girlfriend at the same time....

Arie seems to had a problems already at low overclock and voltage at the begining. Maybe he had bad chip? IT's worth to try and send it to repair under the warranty ("I don't know what happened, but it was lately quite warm on the back").