Heh, bit of a story here which I shall make a thread on in a moment.
Playing through CoD 2, which has been making the Xbox run quite hot and loud for the past day. I moved it out into the open last night to get better airflow and it cooled down a lot.
So today, I play through a bit, and it freezes. So I give it a moment after turning it off (hard reboot, I guess) and bam, like that. Three. Red. Rings.