League crashes, and I get low priority.

The last game I played (as Fiora), the match started normally. But when I walked into lane, the game just froze. My computer was fine, but the game wouldn't respond to anything. I had to restart the computer to try to reconnect but was told that there was an issue with League. So I restarted again, and by the time that I got back into the game, it was around 13 minutes in and my absence led to our team's defeat. This had happened several times before, but this time I got low priority queue for it. I'm not asking for removal of low priority, but please look into this issue. It's really annoying.