Katarina Q, R and B bug

Hi there, I encountered for the 4th time this season a bug with Katarina, while her Q, R and B keys not to be working at a random time of the game for approximately 5-10 minutes each time. This seems to be happening at random times after using R. Please do something about this bug, itis seriously annoying. I tried relogging, even closing client and reopen it and still no use. Thanks