We are aware that the number of reports of this issue has greatly increased since the release of Choose Your Own Apocalypse. A disconnection (Error Code 3) or an attempted reconnection that times out (Error Code 4) seems to be a barrier to some people.
With Juggernaut Edition, we have made some changes to our multiplayer system. We are hopeful that this will continue to reduce the frequency and number of disconnection errors. If you continue to receive these errors after updating to Juggernaut Edition, please submit a ticket to our support staff.
In the meantime, we suggest trying to ensure your connection is as strong as possible and use direct connections via cable to your router or modem, instead of wi-fi. People with stronger connections seem to experience the issue less. Once you start experiencing the issue, we also encourage you to close the game and relaunch before attempting to reconnect to the host. We also suggest having the host restart their game as well.