I think MSAA might be the issue. I turned it off (as much as I hate to) and so far it sems to have stopped my game from freezing so far.
EDIT: played a bit with friends today, still freezing in multiplayer
I have a similar issue but instead of screen tearing my game will stutter going to the F10 map then my G2 headset will go black. I can see the mirror image is fine on my 2d monitor and I can hear the game but the headset image will stay just black. Then I have to reset the whole game.