Any chance you have played as UB, fought against Rook and seen the same? I have only noticed this on my own system and while I have no performance issues its still important that others test it as well.

I've encountered this today myself, those a few movement orders usually get him going again.

UB does seem to have many movement bugs (sticking on corners/flags etc).

Yeah, I get those too. I can't say for certain, but I think I did not get them prior to the last patch. These days though, UB will get stuck and attack orders, or skill usage will do nothing. As if though commands are not received. Movement orders--most likely backwards and into empty area-- will often reset him, but by that time enemy is long gone out of range and possibly used their skills on me.

This happens in more cases than just killing the Rook with grasp. But it could be related to grasp skill though. I'll be sure to keep a closer eye on it from now on and report any findings in here.