Loading Screen almost done, after a while end game screen saying I'm a leaver

So today I started up a ranked game, went through champion select, locked in, and went to loading screen. The usual happened, with everyone loading at different speeds until everyone was at 100% except the Warwick on our team, who was not connected at all. This happens where one person loads slower than the rest of the people, so I just figured he was a toaster and waited. It took forever, so I scrolled through Reddit and checked up on it. Eventually I just force quit the launcher and the end game screen popped up saying I was a leaver and my team was trash talking me. I quickly apologized and they forgave me, but it's annoying because I lost LP and so did the rest of my team. Has this happened to anyone else?