So some days ago i left a coop, after that I didn't made a new island, I just closed the game and went to sleep. So the next day I tried to login and it wouldn't work... logging in loading terrain connection lost: disconnected If someone could help me it would be very nice... A friend off mine had the same problem the past month.. (I'm able to login on a other account)
What's happened is that now you don't have an island you get spawned near the server spawn and the server thinks you're flying or what not. However, you need to arrange a time with a moderator so that they can teleport you there. To message a moderator click on their profile and click "profile page" and ask there, or you can go on Discord/TeamSpeak and arrange on there, or finally message them on the forums by clicking on their profile and clicking "Start a Conversation". Once they teleport you away I recommend that you create a new island and/or join a coop immediately so that when you want to disconnect or you get kicked for an unknown reason this won't happen again. I hope this has solved your question
As dough stated, you have to coordinate with a moderator about a time you can both log on so the moderator can /tp you them. It does work, I've done it many times Shoot me an inbox so we can get this solved and get you back online x)