Need help , keeps giving me this message then ends the game??? happens every game

just means your opponents connection dropped and he lagged out

Things you can check yourself.

Do you have a stable internet connection?
When the unresponsive opponent screen pops up can you still access the internet?

If yes to both of these questions then your opponent has dropped out. If no to either of these then you are losing connection in your games and thus your opponent is unresponsive because you can no long communicate with him. If it were a ranked game you would lose points.

To fix this, try playing with an ethernet cord plugged in rather than wirelessly or look at upgrading your internet plan.