Love the game BUT.....

I have installed the free and purchased version. I can play for awhile everything is great. Then it freezes up after a puzzle is solved. Have to go out of game close it on my phone and go back to the puzzle I just solved and hit the back button in the upper left corner to move on to the next puzzle. This happens on both versions.

Me 2.0yftfgyfyfyfy about Trainyard Express, v1.66