Apple watch
The fall detection stopped working. I have Apple Care.
Apple Watch SE
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Apple Watch cannot detect all falls. Your watch might detect high-impact activity as a fall and trigger fall detection. For more info, see:
Use fall detection with Apple Watch - Apple Support
But if you feel there its really some kind of defect. use the 'Get Support' link at the top-right corner of this page.
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