when I play Shootmania and there are no programs running in the background (except Everest Ultimate and Avira Antivirus), Shootmania freezes everything after every 2nd - 3rd round for about 2-4 minutes.
It doesn't matter if I set the graphics to high or low. Sometimes it also causes bluescreens.
I have noticed that suddenly the CPU usage went from 50-60% to 100% just after 2 rounds. Any ideas how to solve that problem?
Even with similar games (Mirrors Edge, Unreal Tournament, Trackmania(²)) I have no problem, no freezing or the like. It's just Shootmania :/ And it's not fun to play like this!

I also tried to disable Avira Antivirus and/or Everest Ultimate but this doesn't change anything.
Here's an overview of my system: http://www.sysprofile.de/id167691