mine does the same, just randomley crashes three beeps and a blinking red light, this is the only game its ever happened on , its driving me mad, iv reformatted, done the secret menu options and nothing works
my mates slim 12 gig has never done anything like this, and we played gt6 for 6 hours straight on it yesterday maybe its a fatty issue. is isnt overheating cause it does it even if the system is cold