Since my 360 died i have started to use an original xbox to pass the time. it is one of the halo edition ones. I have become addicted to the game thrillville and cant stop playing it. Heres the thing. It seems when i have played for 2-3 hours straight the system freezes. It has frozen on me about 4 times in 4 days. I kind of start to feel when i have been playing for a certain amount of time and sure it enough it freezes. It just freezes whatever is on the screen and stays like that. I have to turn the system off and restart it then it works fine again.

Does anyone have any idea what is causing this? Thanks for the help!