Client Crashing

Since the update to Summoner's Rift, I've had an almost endless issue with my client not responding. Usually when the client stops responding it'll happen at least three or four times before it starts responding properly. It also always happens within five minute of me logging in while I'm in any of the lobbies, viewing my profile, or in the market.

I've also had an issue where the client will close without going to the results screen after a match. I had this happen today three matches in a row, and have had it happen at least three times every day. It's not affected by win or loss.

I'm running a high end PC with Windows 7 Pro. Does anyone have any recommendations for what to do about this?