I know I am not the only who has DS keep crashing when you try to do things like visit neighbors, plant crops, battle in the Arena, go on Quests, Mine, etc. I remember a thread where the issue with having more habitats was that the animations of the dragons cause a large performance drag.
Right now I cannot build a new habitat because DS crashes every time I try to place a new habitat. And YES I am not at my habitat limit, I am at 148 or 161 so I have 13 left!
Here is my solution. Add a setting to allow users to turn off all dragon animations. That way players with a larger number of habitats/dragons can play without having the game crash all the time. If you want to see the dragon animations you can just turn the setting back on.