Your best bet is to call 800-SAMSUNG and schedule a service call. When the power shuts off intermittentely, it usually indicates an internal issue that requires a technician.
I have a samsung 42" plasma, and while watching a movie or tv it will just shut off. The screen goes kinda grey and fuzzy and then shuts off. The little blue light on the bottom of the tv blinks intermitently. The only way i can get it to come back on is to unplug and plug it back in. Then after about 10 min or so, maybe that long it will shut off again, anybody have any ideas what might be wrong?