Great...when it works

My 2.5 year old son loves this app, but it will suddenly quit working and go to an all white screen, which requires a total reboot to fix. Two year olds are not known for their patience so it is frustrating and disappointing for him. I paid $9.99 for the full app with all stations, I expect it to work. Fix it, please.

Stidoh about Chuggington Puzzle Stations! - Educational Jigsaw Puzzle Game for Kids