Mind you, this issue is real and affects all Apple Watch models with watch OS 3.1.1, as evidenced by feedback sent to Apple, this thread on Reddit and another one posted on the Apple Developer Forum.In a nutshell, watch OS 3.1.1 no longer displays the dedicated Lock option at the bottom of Control Center when the Wrist Detection feature is enabled.This i OS manual guide will help you to install the latest version on your i Phone, i Pad or i Pod touch.

And you guessed right—you’re now forced to disable Wrist Detection in order to be able to manually lock the watch using the toggle in Control Center.
On your Apple Watch, go to Settings → General → Wrist Detection, then slide the Wrist Detection toggle to the OFF position.
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You can back up your device using i Tunes or i Cloud. In i OS 9, Apple recommends setting six-digit Passcodes instead of the usual four-digit Passcodes on the previous i OS.
You can read the detail manual guide on how to back up your device via i Tunes or i Cloud here. You will also need to track down your Apple ID and i Cloud login information.
And when you do share sensitive data with Apple for services like Siri and Maps, it’s always encrypted and never used to build user profiles. As a member of the Apple Beta Software Program, you can take part in shaping Apple software by test-driving prerelease versions and letting us know what you think.
There’s so much to say about i OS 10 — here are just a few of our favorite things. That’s why i OS 10 uses on-device intelligence to identify the people, objects, and scenes in Photos, and power Quick Type suggestions.
The compatible devices are : Next, you have to make sure your device is charged up.