Brunty

My tail is acting wierdly, I have tried everything I can but cant get it to fly properly, It was fine yesterday but I must have landed heavily or something because when I next flew it my tail was wagging, so I had tail gain on transmitter at 61% and it was wagging but even at 50% it still wagged just a bit slower, when I turned gain up it wagged really quick... I tried everything I could think of but couldnt stop the wag, so i think its mechanical. The tail doesnt move so freely and i think somethings ...