Why does my Apple Watch keep turning in and off while charging
Why does my Apple Watch keep turning on and off while charging?
iPhone 5c, iOS 9
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It sounds like a hardware problem, but the first (and simplest) thing to try if something isn’t working right is to restart your Apple Watch and its paired iPhone. If necessary (device not responding), try a forced restart. Both methods can be found here:
How to restart your Apple Watch - Apple Support
Restart your iPhone - Apple Support
If that doesn't help, the next steps would be to unpair and pair your watch again and restore from the backup just created. This should result in no loss of data. It deletes all temp and corrupted files and re-indexes the file system.
Unpair and erase your Apple Watch - Apple Support
Set up your Apple Watch - Apple Support
If the problem persists, make an appointment at the Genius Bar in an Apple Store near you and let them look at it. If that is not possible, use the online Apple Sup[port option. Either way:
Genius Bar Reservation and Apple Support Options - Apple