Halp! Client issues.

So im not sure if this is the right place to put this but whenever I enter champ select it 1 of these 3 things happen:

1. My client is fine and works perfectly (gg im happy and my team is happy)
2. My client glitches like crazy and the background is black and I can't see who is getting banned till the little icons on the top show up.
3. My client completely freezes and im forced to close the client and wait 5 min, or if im lucky and I have already picked my champ, I have to wait till we get to the loading screen.

:x Im at a loss at what im suppose to do tbh I've already lost promotions once because of this and Im really afraid that im going to get leaverbuster or something because of it as well :(