Client crashing

I was doing very well with zed.. 28/4 at one point. Then I started to lag, which I understood since that my network is pretty bad. Then my client crashed. I was dead anyways and I didn't think about it. Then I ult this Jhin, and my client just turns off. Bloop, just like that. No error or whatsoever. It just turns off like I left the game. How can I leave a game when I'm ulting Jhin I am not sure, but there is something going on because one of my teammates had the same problem also. New client takes forever to load when you leave a game so I lost the game. I was 30/6 or so when the game ended because that Jhin killed the unmoving Zed. If anyone wants the proof of this I can download my replay and upload it. This is just outright outrageous. After like a 300 mb patch and an additional client patch, now the game crashes with unknown reason. I thought maybe there's a hacker on the other team, since I crashed right when I pressed "R" on Jhin. But I believe kind of hacks that can turn off a program on my computer running remotely almost utterly impossible. Please look into this Rito and have a great rest of your day.