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Sep 19, 2016 10:30 PM in response to cadsase96by Ingo2711,Did you already try to force restart the phone by holding the sleep and home button for about 10sec, until the Apple logo comes back again? You will not lose data, but this can cure some glitches after installing new software or apps.
If this should not work, setting it back to factory settings would be the next step:
Use iTunes to restore your iOS device to factory settings - Apple Support