[CRASH]Fizz Crash

I have had 3 games in the past day as Fizz where around 30-35 minute mark, Ill go into a teamfight, ult, Q or E and the client will completely freeze and crash. I can reconnect 10-30 seconds later but it cost me a game. Anyways I thought it was just my Client, I repaired, still had problems and completely reinstalled. I thought it was just me till I was watching my friend, on a different computer, play and have the exact same thing occur. Freeze, at 31 minutes in and crash, as fizz, after he lead with Ult and Q. I got it 3 times, in 3 separate games. t seems to only happen once per game. But its still annoying when you are fighting the the client blows up, ya know? Well thank you! Tis all