I got this error as soon as the match started:
so the game closed, and forced me to verify. And when it was finished verifying, I rejoined the match and played it to the end. We won.
"Too bad! You moved down a league."
I went down 400 rank for that error, even though I rejoined and won. Why?
Now I'm league 3 again.
I still don't know what caused the game to crash. I didn't realize there was anything wrong with the files.