1. Erase data attempt: Settings-More-Application Manager-All -S Health-Erase data-Restart the phone.
2. Check whether the mobile phone has recently downloaded and installed third-party software. It may be that the software is not compatible with the mobile phone, so it is recommended to uninstall (Settings-More-Application Manager-Select Download-Uninstall).
3. If it doesn't return to normal, it is recommended to back up the mobile phone data (phone book, SMS, multimedia files, etc.). ) and restore the factory settings (Settings-Reset-Restore Factory Settings);
If the problem still exists, it is recommended to take the three-guarantee certificate of the mobile phone and send it to the nearest Samsung service center for testing.