Syndra W bug

Syndra's W (Force of Will) is unable to re-cast (to throw the ball/minion or whatever she grabs) after being airborne or any other lifting up CC. This happens not for the first time but im getting pissed off from this bug because it costs much, kill or a death. i'm making this after a game with Syndra and the enemy team had a Gnar. I wasnt able to re-cast my W after i was knocked/stunned with his R. I do not know if this is a bug or not but the circle for the range still shows and i'm unable to re-cast the spell and she's still holding the thing she has grabbed. I'm saying again this bug doesn't appear for the first time it happened many other times in other games.