I have a Paladin running around in the Worldstone keep. Every now and then the Paladin freezes, and cannot move for several seconds. It is not because of lag, as the animation of the player also freezes, but I can drink potions and shift aura. I just cannot move.
Also, every now and then, I cannot attack. When I select a monster to attack, the player just stands there. If I exit the game, and create a new one, everything is fine. If I move to another place in the game, I still can't attack.