Resetting app preferences
A common troubleshooting step is resetting all of your apps to their factory defaults if you are having trouble with your device; your personal information will not be deleted.
1.
From Settings, scroll to System.
2.
Tap System.
3.
Tap Reset options.
Resetting your app preferences will reset all customized settings on your phone. Personal information will not be deleted.
4.
Tap Reset app preferences.
5.
Tap RESET APPS.
6.
You've completed the steps!
