Error while loading matches

I got this error during a ranked match, and I had to repair the entire client before getting to start playing again. After reconnecting, it crashed again, and once more I launched the client, this time without repairing. After logging in, I was demoted and put on a lower priority queue. Right now, I just attempted to play a normal game.... AND THEN IT HAPPENED AGAIN!!!!

Do I really have to reinstall the whole game now??