Learn to give your smartwatch the off-on treatment

If your Apple Watch is acting up, the best medicine is often to turn it off and on again. In our experience, restarting the smartwatch will solve most of your issues.

In fact, if you do find your Apple Watch has stopped responding, your first step should always be to either give it either a simple restart or a force restart in an attempt to unfreeze it.
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https://www.wareable.com/apple/how-to-turn-apple-watch-off-on-restart-7219