As of yesterday, not only do I experience the game crashing, it ONLY crashes on my first save slot (Vault 101). The Vault only has about 30 Dwellers but I have already gone through many different Vaults so I could finally get the hang of how to do well in the game so I'm tired of having to start over. I have already tested that it only crashes with this save file by opening the other two saves (my friend and my sister both have one) and, lo and behold, the game started up fine with them, albeit a bit laggy before performing better. I've also tried rebooting my device many different times only to have the same outcome. I have an iPad Mini and have at least iOS 7 or better installed onto it so I don't believe that's a problem however if someone sees otherwise please tell me.
Before all this I feel that I also must note the other bug I experienced before this problem came about. Like others I too had Dwellers walk up "invisible stairs" and they would walk through walls and ceilings as if they were ghosts. Whenever that does happen I would try to send them back to where I assigned them but despite that the game would think they're not even there (sometimes it would show that they were working there for about a minute before doing this glitch/bug). And then there's the constant crashing in general but I already know that's a huge problem so there's no need for me to go into any detail on that lol.
I believe that's it regarding the issue but just tell me if you (the readers) require any more information. Thank you!