Sid Meier’s Railroads!

I bought this game and have been playing for about an hour. In that time it has crashed four times. Very annoying and not good enough for an expensive game. (A few hours later): The map has irretrievably frozen - nothing I have tried will fix it. The game is now literally unplayable. A further hour later: I deleted and reinstalled the app. Load a saved game and that did not resolve the frozen map issue.