Similar issue on PC in Online Seasons. Once the opponent is behind, suddenly he disappears from the game. When in the pause menu, you can see that the opposing player has disappeared (see below). After quitting or continuing, the game is not counted (in the below example I was leading by 4 goals in minute 43).
That’s right—when this message pops up, there’s nothing we can do about it; we just have to accept it. In other words, it’s a sign of despair.
I have now tried and disabled crossplay - I have the suspicion it only happens when my opponent is joining as console player... But let's be serious, it is unacceptable that EA is not able to fix these issues for months or even decades. People who pay for AAA prices for such a game have a right to receive a game that is not broken - EA PLEASE FIX THIS ASAP!
