[Game] Unnaturally High Amounts of Lag

Not sure if this gets to go in this category or Help & Support, but whatever.

I played my first game after the patch and queue fixing, and in the game I had extremely large amounts of lag at random times, enough that my screen and my champ was teleporting around. The game froze (I should also mention that my friend's game froze in loading screen and had to restart their computer) and I had to close it and leave it. My ping averages and was around 72 the entire game, yet I still got tons of lag (note: my fps didn't show any changes at all). I don't know why this is a thing, but it is.

EDIT: I also cannot open the client. Whenever I click it to open it says "Another instance of the client is running. Do you wish to terminate it?" to open a new instance, but yes and no don't work, so the client itself just isn't opening.