[Crash] computer completly freezes after last content update

Since the last update my computer is completly freezing after playing for 20-30 min. My screen just freezes and i get some loop sound going like brrrrrr. The only thing i can do hard reset my computer. I have been playing this game since the release and i sometimes got this in some very rare instances, but after the last update i have get this everytime after 20-30 min.





I already tried to reinstal the game, verify cache,... Every driver is up to date and there isnt anything overheating.





specs: win7 64bit

i5 750

ati hd 5870

8gb ram