Mid game (up 7-1, lol) our match just kicked me back to queue. I could not rejoin the match and it's not in my history. WTF happened?

I'm a 29 year old father of two, so this game is not of priority to me. But, a few times a week I dabble and play mostly unrated. Currently G3, but have been D1 in my earlier times playing. Played beta and all, just not into ranked games as...