

The best way to troubleshoot a problem on Apple Watch is to backup the data and restore it. We've got a guide for backing up your Apple Watch to your iPhone and then restoring data from a backup.
Backups include most data collection, like system settings, language, Mail, Calendar, Stocks, app-specific data, and health and fitness data (if you are using iCloud or an encrypted iTunes backup).
Backups do not include calibration data, synced playlists, credit and debit cards used for Apple Pay, and your Apple Watch passcode
Backup iPhone First
Before starting the process on your Apple Watch, it is a good idea to sync the data on your iPhone to iCloud or iTunes. When you do, any previously backed up Apple Watch data is included.
Unpair Apple Watch
The only way to force a backup on Apple Watch is to unpair it from your iPhone. Unfortunately, this is a time consuming process.
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Article Link: Troubleshoot Issues on Apple Watch by Backing Up and Restoring