Suddenly cannot use Q R B keys in the middle of the game - playing kata

I was in the middle of a group fight, and suddenly my Q key stop working, and later on, neither does my R and B key work. I thought my keyboard is broken, but i could still type those keys, and i also tried to log out, restart computer, and change hotkeys. none of them works. So, i lost a ranked game basically because i couldn't use any of my spells. Thanks to the Riots here. After the game, i searched online, and people told me the only way against this bug is to die in the game when you had it....gg