LUX's E not working AT ALL!!!

So I played a game today as lux and after 10 minutes of the game, her E ability stopped working at all!! it worked in the first few minutes then after that it made a glitch. I was totally annoyed about this! Hopefully my team won but the what the helllll!!!! really??? seriously? are you kidding me? like wth!? wow! Jay Z will not be happy about this RITO!