I bought this game with all the current DLC during the QuakeCon sale on Steam. Every time I sleep or wait in the game, it freezes then crashes. I tried disabling all DLC and verifying files through Steam, but it still happens. I had hoped the game would be less buggy by now, but it seems to be worse than it was on release for me(I originally pirated it back then). Here's my system specs:

Windows 7 64-bit
Nvidia GeForce GTX 560 Ti
Intel Core 2 Quad Q6600 3.0 GHz
4 GB RAM

Is there any possible way of fixing this?