Pieces move uncontrollably – Jigsaw Puzzles for Adults HD Review

I have used this jigsaw app on my iPad for 2 years and have loved it but was annoyed with the ads so I bought the upgrade about 5 months ago. It was fine for about 4 months and now the puzzle pieces move uncontrollably and it zooms in and out uncontrollably. Please fix this bug if possible.
Review by Wolverinr on Jigsaw Puzzles for Adults HD.