Apple Watch Restart Apple Watch
If something isn’t working right, try restarting or resetting Apple Watch and its paired iPhone.
Restart Apple Watch. To turn off Apple Watch, press and hold the side button until the sliders appear, then drag the Power Off slider to the right. To turn Apple Watch back on, hold down the side button until the Apple logo appears.
Restart the paired iPhone. To turn off iPhone, press and hold the Sleep/Wake button until the slider appears, then drag the slider to the right. To turn iPhone back on, hold down the Sleep/Wake button until the Apple logo appears.
If you can’t turn off Apple Watch or if the problem continues, you may need to force Apple Watch to restart. Do this only if you’re unable to restart your Apple Watch.
Force Apple Watch to restart. Hold down the side button and the Digital Crown at the same time for at least ten seconds, until the Apple logo appears.