I'm sorry to hear that so many of you are running into MP issues, and I understand your frustration. The team is aware that some players are still DC'ing after X amount of time in game or also being kicked out immediately after joining. We currently have not been able to reproduce these instances on our end which makes it very difficult to fix if we can't figure out the root problem.
I recommend submitting a bug report, so we can add your information and reports to our investigations. Obsidian Support [support.obsidian.net]
Please include the following information:
1. Platform (Host/Client).
2. Multiplayer or Single Player Game (if multiplayer, can you tell us how many players in total in the game, and their platforms if known)
3. Difficulty level
4. Description ...