My D700 hex core/64G RAM/256GB flash has so far performed well, but recently has started to suffer from a hard shutdown on wake from sleep. I simply hit Esc to wake the computer and it's dead. Hitting the power button starts it and I get a error report on boot up. I've had three so far in the last month or so, advice? I'd like to run through my options before taking it to the "Dummy" bar.