afaik this happens when the player's position is set (via setpos) to a cell that is not loaded. but my script always teleports the player therefore (via moveto).
are you sure you did not have a menu open? how long in seconds is 'a short time' approximately?
please try the following:
- start the ship and jump from board. the ship should move on then...
- try another ship
- make a clean save an enable my mod again
- temporarily disable ALL other mods
1. Definitely no menus. It's probably about 30-40 seconds of sailing in a direction.
2. If I jump off the ship and leave the cell, the ship keeps moving, but if I re-enter the cell, it goes to the loading screen again.
3. I've tried two ships, and it's occurred with both.
I'll try 4 & 5 and let you know how it goes.
Edit: Problem solved. I re-enabled your mod and it works fine now.

Once this is past Beta, and has fewer bugs, I'll probably vote it for file of the month.