[CRASH] BLACK SCREEN AT CHAMPION SELECTION

So, my lol client has been having issues since a couple of weeks, and this is that everyday when I try to play, at the moment of the champion select I always get a black screen and cant do anything, so I have to repair the client, then I can play. But the next day it happens again, and again... so, as I mentioned, this has happend since a couple of weeks, I don't know what to do, and it is a little tedious having to repair the client everyday.