Received error: Connection to the server has been lost. Please check your connection and try again. (Hazelnutbeard) after playing on a long session. Couldn't join back in and kept getting disconnected. Was able to join a different session however and play there.
Solution that worked for me - check your default hard drive that has your operating system installed. See if there's enough available disk space. If there's low space - delete or uninstall programs to allow more space for game files. Try logging back in.
More details:
Received this error after a long session. Looked for solutions relevant to "Connection error" or anything related to server connection / firewalls. Found an official article on debugging this (Hazelnutbeard error FAQ. Also, found few forum posts around this (Hazelnutbeard error on PC, Hazelnutbeard error after 11 hours. None of these seemed to be helpful and didn't not help to resolve the issue. Moreover, these articles focus on connectivity, which turned out not to be the problem. One of these articles described an 11 hour session. The session I was in was long as well. This led me to check my hard drive space, and although I have sea of thieves installed on my 2TB HDD with plenty of space left, and my OS (Windows) is installed on my SSD, Sea of Thieves still seems to be using the main OS drive for caching, in this case my SSD. I noticed that my SSD only had 4GB of space remaining due to the caching. Which makes me think even though I was able to join the game, hear the battle music and get instantly disconnected it was because it was running out of space to load game files. I was able to join a different game, a closed session, and was able to play just fine. This makes me think it's because the save files are separate per session, the latter being smaller and thus not crashing yet. I assume a solution could also be to increase the allocated memory to Sea of Thieves, as I have 32GB I would have assumed this would've happened automatically. Not sure if the caching is done by the OS or Sea of Thieves as an optimisation. One can understand how long sessions need loads of storage and thus you run into this misleading error about internet connectivity, when it really is your hard drive running out of space. To confirm this - check your drive's remaining disk space when you join any game in Sea of Thieves - it will change in size. In any case, deleting files and uninstalling software, freeing up disk space, allowed me to join my session back in. Try it out for yourself and see if that helps. Undoubtedly, this error seems to trigger due to internet connectivity issues as well, but if Sea of Thieves servers are up, and your connection is stable this possibly could be the next thing to look at.
