I keep seeing this as a problem that happens to players with connection issues. Although it hasn't happened to me recently, I felt like creating a thread that could help me when I accidentally dc, as well as other players.
Riot should have it so that the the player who does NOT reconnect into the game before it ends should lose LP on a win. I know this might effect some people, but a majority of people reconnect before a game ends and still end up losing LP. Of course, they can be given a leaverbuster or an afk warning for leaving (although I hate both). I feel like this would be a healthy change, as those who even gave their team a chance of winning can feel good about it as well, instead of discouraging players to just give up if they technically lose if they win.