I just got my box back from microsoft yesterday and it was working fine (I sent it in because there was a video problem). Today, though, I tried playing the Rage demo for the first time and once it launched the console immediately shut down. This happened one more time and I gave up. Then I started to watch netflix and got through almost an entire episode of 30 Rock and my box shut down without warning. I'm afraid its going to keep doing this and i'll have to send my box in again. What could the problem be?