Hello Pepper 46,
It sounds like an app you installed is not functioning correctly. I recommend starting with these steps from the article named:
iOS: An app you installed unexpectedly quits, stops responding, or won’t open
http://support.apple.com/kb/ts1702
Close the app and open it again.
Turn the device off and on.
Update your device to the latest version of iOS.
Update your apps:
- Open the App Store and tap Updates.
- If updates are available, tap Update All.
- If asked, enter your Apple ID password. The updates will download and install.
You might need a Wi-Fi connection to update some apps.
There is additional troubleshooting in the article if this doesn't resolve it.
Thank you for using Apple Support Communities.
Cheers,
Sterling