There needs to be a better way to detect afks in ranked.

So I'm in my flex que promos, and I win 2 games. I was on a roll, happy that I might get good placements. Then, within my next 6 games, 4 of those happen to have a player afk, 2 of those conveniently right after the remake expires. The other 2 were lategame, which made it a 4v5 when we really had a chance at winning... I'm not saying much, but there needs to be a way to stop these afkers later in the game, because it really destroyed my promos.