Rynetory, this is a widespread issue - if you look at the battle and spin to win threads there are lots of complaints about it.... I have an issue with this on my iPad all the time but not my iPhone, not just with visiting neighbours though... the game started crashing for me a few months ago when I did an iOS update (I hoped the next iOS update would fix it but it did not)
My iPhone is still on iOS 9.3.2 ... iPad on iOS 10.2.1 if you look online iOS 10 does have a problem with app crashes