Apple Watch possible hardware failure
My Apple Watch no longer recognizes my WiFi or my iPhone. How do I test it to determine if I have a watch hardware failure?
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Perhaps this article will help:
If your Apple Watch isn't connected or paired with your iPhone - Apple Support
If you still need help, contact Apple Support.
Or better yet, make an appointment at the Genius Bar in an Apple Store near you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple