I've been having this same problem since May of this year, when they added an update that introduced crossplay support. I had hoped that maybe the issue was my awful system, but I upgraded and tried it again today and had the same issue.

I know exactly how you feel, but the best thing that we can do is to continue to report on the issues, I'm hopeful that now that many more people have experienced the same issues that I have been having for over half a year now that it will be taken more seriously. When I was posting about it 6 months ago I was just a getting a barrage of 'works fine for me' type comments that just made it feel like I was totally alone with this problem.

Even though I have seen no fixes for this issue, the fact that Sean Drohan has consistently replied to these tech support threads gives me hope that there are devs who are working to resolve this issue among others.

I know its holidays now so I wish the team happy holidays.  I have hope this will be fixed at some point, Would be a real shame if not as its a lot of fun playing with friends!

Happy New Year everyone! How is the fix going? Still willing to play the game with my friends

It doesn't really have to be the same map, just get it working again so multiplayer is viable at all.

There are no updates at this time I am afraid.

Sean Drohan
Stardock Support Manager

I honestly admire my own patience at this point and the fact we continue playing (or rather volunteering as QAs) while it continues to crash.

One thing we noticed after several other maps is that artifacts that spawn ships/creatures (overlord ship, space monster) always make the game hang up at the end of the turn they were spawned. If we restart the game and refrain from using these artifacts, game proceeds normally that turn.

Hope you guys fix this soon.

If a chargeback was possible for the GalCiv IV preorder. I  would do it.

Well, TargetMaster, sorry you don't like our salt but we're tired of not having this fixed in a game that was relesaed back in 2015. 
It's been 7 years since this game has been released, we love it, we bought almost every DLC, got over 800h of gameplay recorded and the one thing that keeps us away from playing it as intended is some stupid connectivity/stability issue that Stardock has failed to fix until today. It is important to me that startdock knows how some of their player base feels about this and if they fail to deliver the stability we expect from a game we pay for upon releasing GalCiv4, believe me, there will be waaaaay more salt than you see here today.

Therefore, thanks TargetMaster, but me and my salt will stay here.

Your frustration is noted, I share it to be clear, but it need not drift away from the topic to get your point across. 

I have nothing new to report on this, however, it would be prudent to remove all DLC (uncheck in Steam) for all players, no MODs, not user-created races or ships, just the absolute vanilla game. 

Also, and prior to any test, this dir should be renamed so the game, upon 1st start, can recreate it in a default state (do not edit any settings prior to the test):

\Documents\My Games\GC3Crusade
\Documents\My Games\GalCiv3

Or any other dir that has to do with GC3, again, rename it so the game can create a new one once run.

If it runs well for MP, add one DLC at a time to see what one causes you issues.

Report back.

Thanks.

Sean Drohan
Stardock Support Manager

Slower than half a year since the bug was reported by someone else and nothing at all has been done? Do you expect this state of affairs to make me or other people reconsider?

Now the game locked up on the invasion screen, with those stupid dots running around a single tile instead of moving towards the target city. There is no way to leave the screen other than pressing alt + f4 and rehosting again.

What, are we supposed to be listing all the bugs that are still here forcing us to rehost every 2-3 rounds in late game so that your devs can continue working on GC4 and blatantly ignore GC3 cause it's no longer generating substantial revenue for the suits on top? We've been telling you there is a problem for half a year.