ArmA II Random Lockup

[rusky25]

Hi there, i just recently have gotten the demo of ArmA II off of steam, through playing most of it i am receiving a very odd issue i cant seem to find anywhere else, When i got to load the game it loads fine, i get to the main menu fine, i got and load one of the training missions fine. I get to the map and hit begin and works loads fine, now when i get to any of the levels it works for the first few minutes and then the Game just Freezes with the sound still going, i wait and it just clicks off, does not crash to the desktop, nothing. so i am forced to restart my pc.