I have also been having these problems and it really is getting ridiculous.
I’m using a 2GB NVIDIA® GeForce® GT 540M Graphics Card, it is not over heating whatsoever, my CPU is not been overworking at all, and nor is the memory. I’m having to run the game on the lowest settings just so that I can play for five minutes without having to do a hard shutdown and a reboot. Even so the game might crash lightly, but majority of the time I’m having to do a hard shutdown. Really not liking this.