In my quest to find why my game minimises and locks up after 30 mins i was looking at the processor performance. As its a dual core it has two graph windows, when the game is running in its minimised locked up mode the first core is running at max (total usage 50%) could it be its only using one core to run the game and can't handle it? Only recently got my new pc so i am still understanding how the dual core works.
The processor is a Core Duo E6400 2.1ghz.
Check out this post. Let us know how you do.
Also take a look inside your case it may need to be cleaned out.
Dust can overheat and shut down the sim.
Maybe you can add another fan or two.
Have you properly activated the software?