A recent post by a Ubisoft communty manager on the GRAW Xbox 360 forums has indicated that the developer is aware of the rampant reports that Ghost Recon Advanced Warfighter 2 freezes frequently, rendering the game unplayable. While the community manager offered no information to help resolve the problem, those experiencing issues have been urged to contact technical support so that a solution can be found.
You can contact Ubisoft support by going here.