First time i had freeze problem, i played the game for about 45 minutes. But after first crash, when i opened the game, i had the freeze approximately at 10-15 minutes after i start to play. Last freeze i had is at the 10th minutes after i started to play. Freeze happens randomly. I think, it depends nothing on the game itself. None of the freezes causes by same thing. Just random.
Game files: http://rapidshare.com/files/424230178/Arma%203.rar