Something is causing the replication reliable buffer to be overburdened, causing you to be disconnected!
This crash tends to happen when joining a multiplayer game with a lot of content. It can sometimes take a while, ex. a certain number of buildings placed or schematics to be unlocked, for the problem to actually appear. Try the following:
- Installing the "Fix Reliable Buffer Overflow" mod created by the SML team to mitigate one of the most common causes of this crash - Removing mods that introduce lots of recipes or schematics (HUB/MAM/shop unlocks) or Mod Savegame Settings.