Need help finding problems

Hello everybody! I released my app, Pixel Studio, back several months ago. It is steadily getting more downloads and has usually received pretty good ratings. However, over the past couple of weeks, I have received way too many 1 star ratings, which has caused my overall rating to drop dramatically. Most didn’t leave comments, and there has only been 1 bug reported. Google Analytics has reported several issues with my in-app-billing code, even though I haven’t changed that code in months. I have never experienced any problems though on any of my devices.

I have updated the code and uploaded it to Google Play as beta, and really need some people to play with the app for a few minutes and let me know if they experience any problems.

To test, you must join the Google+ community here: https://plus.google.com/u/0/communities/113388274400267882675. Then download Pixel Studio from Google Play using the link in the community.

I really appreciate the help!!!