Me and my brother have been having issues with multiplayer. We have played multiple sessions in huge galaxy map fine. Then one day it started crashing while I was loading into the lobby. It doesn't make a difference who hosts the game will always crash when one of us joins the lobby.
We tried going back to an older save that we had and it worked, after that session we saved it again and when we started it back up it crashed again in exactly the same way, no matter who hosts it always crashes while trying to load in.
The save works fine if I start it myself without anyone joining the lobby. Its only the one who tries to join that crashes.