1. Hard reboot on your iPhone
While pressing the power button + Home key, press and hold at least 10 seconds, until the Apple logo appears then release, this reboot different methods and pure shutdown, so the device will be reset (reset), there may be a clear part of the errors and problems.
2. Update latest firmware for your iPhone
If you are not the latest version of iOS, may wish to update and then see if the problem persists
3.Do factory reset with iTunes
If the above two methods are useless or not work, Possible to use iTunes to restore the device to factory settings, remember need to back up before factory reset, otherwise your willl lose all data on your device.
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