Sorry, I unfortunately have no other way to test the game.
I can gladly explain in detail how the problem has come.
I did a fight against an NPC. After the fight "ESC to leave" is still in the instance my ship disappeared and i was under water. I just finished the game with Alt + F4. Report function was not possible. Since that incident I have the problem.
During the battle, I watch the information bar Ingame. Under I/O I habe all the time a connection to the server. No lags, nothing. At the moment when I confirm leave battle with yes, the I/O drops to 0 and my ship disappears. After 20 seconds comes the message "Battle over [Connection lost]" an after 20 seconds again I stand in the habour.
I can show you the problem gladly ingame, if you want to see this as gamemaster. I can also create a video.