Hey there @sestus2009, thank you for reaching out!
When playing in cooperative mode, you’re using a peer to peer connection to other players, which means that’s your game session is isolated from our / G-Portal’s services and servers.
We’ll need additional information in order to determine the source of the issue, such as how much load does the area that causes disconnections have in terms of NPCs, placeables, buildings and light sources, as well as whether the issue occurs if the host visits that area on his own in singleplayer.