I've had my 360 for about 18 months now. It has always behaved perfectly... until this afternoon.
I booted it up for a round of Fallout 3, everything loaded fine... I played it for about 10 minutes... then the screen froze.
So I shut it down, waited about 5 minutes, and restarted it.
Again, everything loaded fine... again, 10 minutes into the game it froze.
So, 3rd time is the charm. Tried it again... same problem.
What's up with this thing?