I have seen many people sharing that they are crashing quite often since the Halloween update. I am not sure if my experiences are the same as others, but, as soon as the roof I was building was complete and above my head, I crashed. Then after finishing a floor above me, I crashed. Its whenever I build something above me that I am crashing. Thought maybe because people are saying they crash when going into or out of caves, canals, etc...its not a stretch to think that a roof being built over my head would be the reason that I am.