Apple Watch went to black screen, it vibrate when I have a notification and now want do anything
How to fix this problem
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Best reply
First force restart the Watch
i.e. press and hold both the side button and Digital Crown for at least 10 seconds, then release both buttons when you see the Apple logo.
Then, although it may seem irrelevant, while it is restarting Force Restart the paired iphone Force restart iPhone – Apple Support (UK)
Test it for a while. If it is still misbehaving... Unpair and set up again
Unpair and erase your Apple Watch – Apple Support (UK)
and then
Set up your Apple Watch – Apple Support (UK)
You may also want to make sure the software on the watch and iphone are both up to date to the same level.
Update your iPhone or iPad - Apple Support
Update your Apple Watch - Apple Support