I'm a bit heartbroken about this. My PC has a hard-to-pin down issue wherein it occasionally freezes up without warning when doing something graphically intensive. When it comes to Sea of Thieves, it's uncommon - maybe once or twice a session, but more usually I can play all night without an issue.
At any rate, gaining the option to rejoin a lost session sounded like a gamechanger for me, removing the primary source of stress when I'm solo slooping. (Nothing worse than putting in 2 hours of work, then losing it to random chance.) But for whatever reason, the Rejoin Session option just doesn't work for me. Whatever it is that causes my PC to instantly seize up, looks like the game registers it as logging out rather than a game crash or lost connection.
This is an issue with my hardware, I know; can't even call it a bug. Just venting. Oh well; back to sea!