It's not really related, but the DS version has a (rather nasty) reset bug as well. You can chose to return to the title at any time during the game, as long as you have access to the save menu. If you do this while the Enterprise is still trapped underground (it stays put, even after the dwarven castle events), and start a new game, then the Enterprise will disappear as soon as you land it for the first time in that game (its location is still set to the underworld). I know for certain this affects the Japanese version (I experienced it first hand), but it's likely been fixed in the US and EU releases, since they came out long after it was discovered. I was never foolish enough to risk playing through a good portion of the game to see if it still happens.