Yasuo Ult Bug

I played a game with yasuo today and i couldnt ult at all and it is really start to get annoying it happens in so many of my yasuo games and my friends tell me it happens to them too. Im not a yasuo main but i do play him quite a bit and the bug is really annoying, i feel useless with yasuo if the ult doesnt work. I've checked my key bindings and made sure it was all okay and it was and i still couldnt ult i even looked through a replay of the game and saw if i was snared or stunned or anything that would stop yasuo's ult but i saw nothing. I think it really needs a fix as it will affect One Trick Yasuo players and would be really fustrating to them and other casual yasuo players.