I was trekking across the ocean to get some acacia trees, and found a shipwreck. I dove down and emptied the first chest, in the hold, all good. Then I went into the state room at the back and tried to open the chest, and suddenly got kicked.
I figured it was just a network error or something, so tried logging back in. That didn't work at first, had to wait a couple of minutes, then the server seemed to come back up. It didn't remember me having looted the shipwreck yet, so I went back and did the same thing again, and I got kicked again (and the server wasn't immediately available after that).
So... I think the server crashed because I was trying to open a chest in a stateroom in a shipwreck.
I got a notification that it had crashed and auto rebooted.
A treasure so awesome that it crashed the server