Dror Ragzlin - Crash or freeze during the fight

[Laalu]

I've been doing the fhe fight against Dror Ragzlin several times now, but it always end up the same way : the game freezes, I'm unable to end the turn, a NPC is stucked during his turn or I can't do anything after Dror Ragzlin dies. So far it has been a really frustrating bug, since I'm unable to end the fight and move on...