Katarina need to get fixed!!!!

When i play katarina, after some minutes i couldnt use q/r or b.... I try to change it to asdf but nothing happend... Its bug of the game play and i cant fix it.. You have to do this and plz make it at 5.6! Or later at 5.5... Please riot, i am not the only one who saw it... Why you didnt?? How is posible you didnt see it?