If Anyones Having Game Freezing Especially when playing Warcraft with 13.4, I also Have had game freezing from the new 13.4 roll bac to 13.1 will should help solve this, maybe this link will help you it work for me http://eu.battle.net/wow/en/forum/topic/7427294048 i know its a battle net link but the topic and how the 13.1 catalyst will fix freeze probelm might help..
plus i really hope amd comes up with a hot fix to resolve this issue of 13.4 hunging and freezing..
There seems to Be a problem with the new ATI drivers that makes the Game hang and low fps in General. Rollback to 13.1 seemed to fix the problems for me. So if You have New drivers, only rollback Will fix it.
maybe this helps