Is matching with bad teammates = AFK??

I can't remember a single game this week that I lost that wasn't a 4v5... This is the first lose after a 9 winningstreak. And this is not the first time this happends. Last time I had a winning streak like this I had to deal with 6 4v5 games. I will count how many this 4v5 games the system will give me now...

I have no problems with losing a game. You will learn more from it than when you won that game. But in the case of a 4v5 you generate a situation you will learn nothing from. But it feels like the system intentionaly gives you these cases when you have a high winrate.