I got my Xbox 360 in July 2011, 250GB hard drive, brand new, and aside from the brick being noisy on occasion I haven't had any issues with it at all. It's been in the same place the whole time, and a few months ago it suddenly shut down on me in the middle of a game with no warning whatsoever. I touched the console, warm but not really hot and no red lights there, but the brick itself was pretty hot and the light on THAT had gone red. It stayed red and even after it had cooled down, the unit would not power back up. I unplugged it, plugged it back in, and it turned on again.
When it started doing this, I generally could only run it for an hour or so before it would shut down. Then after about a month it stopped doing it altogether and ran normally without any problems whatsoever. Now, about three months later, it's started shutting down again after about an hour of play.
Is it just the brick overheating? It's noisy but it's always been, so I didn't think it was really an issue. I've tried moving it out more into the open, hoping better ventilation would help, but it seems to have no effect. Anybody know what's going on here?