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Helpful answers
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Sep 17, 2016 2:46 PM in response to psm_londonby Ingo2711,To make sure that this is not software related, set it back to factory settings, without using the latest backup. Test the phone. If it works, restore from the backup.
Use iTunes to restore your iOS device to factory settings - Apple Support
If factory resetting does not help, get the phone checked by Apple: