About 3 or 4 times already, I have found my 12" Rev D PB seemingly turned off and I have had to turn it back on again after I had left it in sleep mode just fine. It has been particularly warm in all of those cases. Put simply, I think my PB has been overheating and shutting down (though I'm not entirely sure). I was wondering if there is anything I could do to remedy this or keep it from happening again. I appreciate the help.