Constantly Crashing

Okay so Im a fairly new college student and I downloaded a simple app to text and write on. It worked wonderfully the first time I actually had to use it. The ads were enough for me to handle. Then it started to be weird and close on me so Id restart my iPad and itd be fine after that. Now I cant even get into the app! Its constantly kicking me off so I cant take notes let alone even look off the previous ones. I hope this is just a bug and not a devious attempt to make money off of us because lets face it, $15 is too much for an app that I could get all my school supplies for. :/

0NightRose0 about Notepad+: Note Taking App, v3.9