Darius dunk master skin bug

Sometimes darius get's stunned and stands there when he is using w and the other vlad uses his pool, or the minion dies before he can finish his cast. And also once when he was up against a malphite while trading he wil get stunned and not move or attack he just stands there while malph keeps hammering him and no it's not internet failure. Trading as darius is pretty slow now, on top of that these bugs and glitches just destroys any chance to win the game. please help fix this bug, because it's the best skin of him, and would really like to play with that skin again! Also I am not sure if this is a skin related problem in general, but I assure you it's a problem. He does gets stunned or rooted and does nothing. An early response will be most appreciated. Thanks.