Disconnecting when playing co op

Me and my friend are playing co op for the silver cup and it has kicked us out for 12 games now where it just says you have forfeited the game even though there is nothing wrong with either of our internets, we have to go get 20 wins out of 35 games and this already wasted 12, please someone fix this and please it would be appreciated to restart my entries because it’s really unfair