“Unit keeps turning itself off. For the past month my DX55L150A11 (purchased @ a Dallas Best Buy, 02/22/2011) will just go to sleep. Turn it back on and again the unit turns itself off. I've had the AT&T service tech to disconnect all other peripherals, the TV again would turn itself off. It may be on for minutes or hours, then all of a sudden it turns itself off. Q: IS THERE A FIX FOR THIS PROBLEM OR IS MY DX55L150A11 ON LIFE SUPPORT, APPROACHING DOA.”