[2020] The game is ABSOLUTELY UNPLAYABLE. FIX YOUR DAMN SERVERS!

I bought the Warlords of New York DLC, beat it with my gf but now everytime we want to replay it, there are sync issues and she is kicked from the game. It is either that or the game desyncs from mine and we are often experiencing different bugs.
How is it possible that for a game that already released last year is still experiencing connection issues?
FIX YOUR DAMN GAME