When im in-game, everything works fine. And suddenly sometimes my game just freezes, i need to alt-tab and end the process since arma 2 oa seems not to be responding.

http://www.youtube.com/watch?v=qeJGSkqbRZE

Happens like this, just not my video.
Any ideas how to fix?
Have tried verifying cache, tried difrent nvidia drivers.

This is happening to me as well. What GPU do u have?