When player load/unload chunks where ship is located, huge lag spike freeze the game.
Depending on PC setup and ship size, freeze time can variate between a couple of seconds to 1 minute.
For GTX 1080 / 13GB RAM reserved for the game and high graphics settings, freeze is about a minute.
For 50GB RAM and same set-up freeze time reduce, but still too long - about 20-30 seconds.
When player dies near rendered ship, and respawn somewhere near by, the lag spike time doubles (looks like game unloads and than loads the ship).