League of Legends Client Freezing, Glitching.

While in champion select my text and buttons all vanished. My game ended in a remake because of an AFK. Next time in champion select my client completely froze causing me to lose a promo game. When I tried re-queueing I hit Play -> Summoner's Rift -> Ranked -> Solo and it reset back to the "Play" button and did nothing. The second time it finally worked.

My Client was taking up about 1200 MB of memory in task manager.