AFK'ing (intentional or not)

For the past 5 games, I have had an AFK in ranked. Mainly ADC'S, but other too. I don't know if these people have bad internet connection, get titled, or have something more important come up.. But they sometimes come back only to feed cause they are so behind or just don't come back at all. I think riot need's a more severe consequence system for AFK's or leaving the game in general even if you come back. I'm tired of losing all of my LP because of this. Please tell me someone else is experiencing this and I'm not just unlucky.