Walking Dead on Mac Restarts Computer

Hi,

I've got a MacBook Pro with Quad Core 2.3 i7, 8GB RAM, a 1 GB graphics card, and i'm running OS X 10.8.2. I bought the Walking Dead through Steam and am playing that version. For some reason I can be playing for a while and then all of a sudden the game will stutter and the whole computer will restart itself. No warning or program crashing. The whole machine just restarts. Can anyone offer any advice? It basically makes the game unplayable because you never know when the computer will just tank out. I don't have this happen with anything else or any other graphic intensive games.
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