QUOTE(shephard86 @ Dec 9 2014, 03:00 PM)
As the title described I'm experiencing constant screen freeze during gameplay especially during WoL campaign. The screen just freeze but I can still hear the game going.
The battle net forum said it's the GPU problem but I'm pretty sure my GPU does not have any problems at all because other games such as Diablo 3 and Dota 2 does not have such problem.
Any sifu here know how to solve this problem? It spoiled my game many times already.

please provide your task manager HDD resource utilization trending during the game play before/during/after and ESPECIALLY during freeze.
a second monitor may help, else enable data logging/log writing to a file etc.
additionally, are you using on board sound card or external sound card? can try lowering the sound channels or even disabling sound completely and see if it helps?
for gpu, is it possible to do a gfx card swap? i have slight suspicion that your graphic card rams may have overheated/faulty.
possible to do a gpu/graphic stress test and see if you can replicate the issue?
a quick run down would be to do a clean uninstall of ALL your pc's drivers, and reinstall all of them on the latest drivers if you haven't already. (don't care other game can or cannot.)