Hi, the matchmaking issue has been reported several times on this forum, but apparently they either don't want to fix it or can't fix it due to the limitations of the now rather old game.
I solved the problem myself simply by not playing Rivals anymore.
It's not a satisfactory solution because it's a mode I've always played, but at least this way I don't get angry anymore!
EA has definitely lost my trust, and I will never buy the ULTIMATE version again, and I will get the standard version (if I get it) when it's at a reduced price!