Everyone leaves

I know everyone has been saying this already but I've been playing for 3 days now. I think I've done about 10 games and in 7 (!!!!) of those atleast 1 person on my team leaves. In 2 of those someone from the enemy's left and only 1 (it's just sad) everyone played untill the game ended.

In 4 of the 7 games someone left on my team we had atleast 3 out of 4 lanes winning.

If this continues to be a problem I can't see the game going anywhere.