Game freezing (not crashing)

Happened 3 times while fighting the boss in the tam tara deepcroft. The screen freezes, inc the mouse cursor. After about 10 sec the game unfreezes and you can carry on playing. But this is very annoying because I was the healer and my party had died during the time I was frozen. Happened 3 times during the same dungeon.

Also in this very same dungeon during the BETA I had the only proper crash I've seen in this game.

I had played through this dungeon the day before with no problems so I don't know why it only does it sometimes.


ATI HD5850 1GB
Corei7 3.0gHz
6GB DDR
2TB HD
Win7 64bit
Latest drivers