Q/R/Recall not working on some champions

This may or may not have been posted a few times already, I'm not sure since it seems to be quite a rare bug. But it has happened to me a few months ago with Vi and twice in the last week with Katarina.

The Q, R and Recall skills simply stop working during a game, randomly. I changed the keys assigned to those skills, I checked if my keyboard language was correct, even tried activating them using the left-click. It's not a hardware or hotkey assignment issue, those skills simply refuse to activate no matter what I do.

I googled the issue when it first happened with Vi, and there were no answers, and I did the same now and still, no one knows why this happens and it was never fixed. The only way to fix this is to wait for them to randomly start working again (sometimes they never do), or to shut down the client and launcher, risking getting punished by Leaverbuster for leaving the game.

This is a serious gamebreaking bug and I would appreciate if someone looked into it soon.