I've tried almost everything now. It's still crashing randomly. The strange thing is I travelled just to see if it happens there and I don't get random crashing when travelling but I do when they are home in Union Cove. I have now even wiped all of the large mansions but the Artist Colony, Pam's Palace and Carl's Castle. I've removed the pier, several other community lots. I've done DEP, Factory Resets, Cache Clearing. Apparently it's my Graphics Card that might be causing some of the crashes. I can't afford a Card just to be able to play one world when I can play all the other worlds fine on mine.
So I only have a few things left to try before the possibility of moving the legacy. :/