Ivern R seems to not work after a few uses

Hey I recently played a few games of Ivern in bots and after a few uses of my ulti ( R ) it seemed to be bugged and i couldn't use it again, even if i died to tower my ulti ( R ) would still not be able to work. I think it might be something to look into because if this isnt only for Bots and it happens in other PVP games it would be lethal to Iverns kit as he would not have a ulti ( R ) to use for the whole game ! please look into this !

• If anyone has this problem with Ivern please tell me if theres a way to fix it in game