Keeps crashing

I have had this app for awhile, and I loved it a lot. So much so that I bought a month subscription. I had been so excited to try the new pictures, and use the colors, but when I attempt to access certain photos the screen loads for a good minute and then the whole app crashes and sends me back to my home screen. Not only that, but when I actually manage to pull up a picture, I have colored in a good portion and I press the undo button, and the app crashed again. When I went back on to try again I found that none of the coloring was saved, and I had to start again. This is highly frustrating to me, and unless this gets resolved I will NOT be renewing my subscription.
That being said prior to these bugs, this app has been a fantastic relaxer app for me. I love scrolling through the others art and liking and commenting a particularly beautiful picture. I do hope that these bugs get fixed so that I can enjoy this app again. Thank you.

To little dude about Recolor - Coloring Book, v4.1.1