Can't use keys ingame

Whenever I join a game I can't use any of my keys meaning I can;t use abilities, NOTHING. Sometimes quieting the game and reconnecting fixes the problem but 75% of the time when it happens its unfix able no matter what I do.

This bug has been going on for an entire year and is still not fixed. I've made multiple reports about this and emailed riot myself and it still hasnt been fixed. And its not just me this happens to a lot of my friends as well.

This is a huge game breaking bug because it means I either get reported for feeding because I can't do anything for my team or I get reported for leaving the game.

And please don't ask me if I've re downloaded the client or repaired it because I already have and it doesn't work.