Love this app!! BUT......... – Adult Coloring Book | COLORS Review

This is the most user-friendly app out of all I've tried! I "colored" about 10 pictured already and was so pleased with their beauty! That said, the following happened TWICE (2 different pics)... while just about finished with VERY DETAILED pics that I worked on for over an hour, the app closed on me! I was so excited to have the pictures nearly done, as they were turning out so beautiful, then BOOM! They were gone! Then I reopened the app, only to find only like 2 leaves colored in! I was sooo discouraged and mad!! PLEASE FIX this problem! If it happens again, I will have to delete it, as it's just too frustrating!! If it didn't have this problem, I would've rated it 5 stars!
Review by Pjo777 on Adult Coloring Book | COLORS.