Crossplay, Player can quit and you will lose the game, eventhough you didnt quit

Someone lost in rivals, he is a pc player and beat him fair and sqaure, he just put away his controller and did something with his pc. I was still ingame and i played. Somehow he made game shutdown and ultimate team to break, the system registered that I quit. And wasnt able to poromote to div 4. thats crazy how cross play can manipulate this game. This kills it for me…