Lag ? but ok before

So I got this app like 3 days ago and it was great! But yesterday I got on the app and tried to color a picture but it closed the app immediately. I tried again like 5 min ago did the same thing I was very disappointed. I won’t delete the app just yet.

Blueberry 999999999 :-) about Recolor - Coloring Book, v4.1.2