Starfall

What changed in this game that makes the screen slide up and down at least 10 times per round rather than just letting me swipe the gameboard. Before I would only swipe the screen up if my finger accidentally swiped outside the play area, but now even when im well within the touch screen play area my screen swipes down all the time. When I play it in full screen mode the sensitivity is WAY to high and I can't control them, so I have to play it the smaller screen. But why did this happen? I used to be good at that comp... :(