Answer to "Why is my Xbox 360 shutting off while playing a game?"i Had this issue, it ended up being the flex for the touch power/ cd eject buttons. to make sure that's the issue i removed the face of the xbox and disconnected the flex. xbox worked flawlessly after that so i just replaced the flex. no problems since.
Answer to "Why is my Xbox 360 shutting off while playing a game?"This issue happened to me, tried the surge protector, checked my power supply for over heating. The issue ended up being the power ribbon running behind the face plate. Xbox 360 Slim