Katarina's R won't work.

Over the last month I've been facing a bug with Katarina's R not working in group fights. I'd E, W, then R and she will just stand there without using her ult. It's cost me more than a few teamfights as I'd stand there for a second waiting and then when I look at it, nothing. She just stands there like no input went in. At first I thought it was my ping, but it isn't. EuW isn't the only server I face this on.
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