This same thing happens to me, except in in COD4. I am running the new Nvidia drivers, the 177.92 and the game runs great. Then it will just freeze and i will have to manually boot.
I have a guess that it may be slightly heat related. If i run my fans at 80%, I havent had a crash yet. If they are lower than that, I start to see crashes. Sometimes there are random little stutters as well.
I really dont know why it does that, but my best guess is heat and driver related.
I had the 175.19 drivers before this and it was happening then as well.