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Question: Face ID on iPhone X doesn't work periodically

Face ID on my iPhone X periodically turn off and ask for a passcode, but device not rebooting, and battery is full, after entering passcode and block device, Face ID again ask for a passcode. Problem solved after rebooting device, why it's happened?

iPhone X, iOS 11.1

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Answer:

Get help with Face ID on your iPhone X - Apple Support

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Question: Face ID on iPhone X doesn't work periodically