Leavers in ranked

I wanted to bring something that maybe has been brought before. The leavers in ranked game. Lately i've lost more game than ever because 1 game out of 2 ~ 4 someone in my team just leave... Out of nowhere. Is it coming from those crash that many ppl have (even i had some) ? The game just crash and go back to windows screen, w.o even giving a error message... I gotta say losing elo becasue they can't fix bugs is kinda anooying...

And even if it's not in my team, I'm playin ranked to play fair, not on some 3v2 or 4v3 game that either will be instant win because their team surrend, or because we out number them...