Apple Watch Series 3 not responding
Apple Watch Series 3 not responding after hard reset the Apple Watch only works for a few minutes then screen goes blank again
Apple Watch Series 3, watchOS 7
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I would start here:
If your Apple Watch won't charge or it won't turn on - 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 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