Found this thread after trying to finish the Balthazar fight. The game disconnects each time after the mission is done. Skipping the cutscene at the end only pushes the DC a bit further, the game then DCs in that bit of aftermath.
Done this 4 time, 4/4 disconnected. I give up.
And I had thought I solved the DC issue about a week ago, when I kept having them in story missions.
Any help or general wisdom would be welcome.
Also, sorry to revive this thread.