i had this problem months ago already, it looked like i solved it by forwarding every suggested port, but the issue returned yesterday.
in every game of FUT (Champions, DKT, Div1) AND Seasons, i lose connection with my opponent at some random time within the first 20 minutes. it worked fine on sunday for 10 straight FUT Champions games, then the issue appeard in every game.
there must be some sync issue, as i don't think everyone is a disconnect cheater: one opponent even paused the game to make subs and change his formation, etc.
anyone have an idea what i could do to prevent it? i never had this kind of issues in previous years.