My League Keeps Getting Corrupt

So this has happened a couple times in the past week whenever I just get past champ select into the loading screen it bug splats and it says there's a problem with my installation and trys to do a repair. Whenever this happens it doesn't do anything so I need to exit league and do a full client repair and this takes way too long for me to load back into the game. It has happened 2 times today and I've lost LP because of it. How do I fix this?