Apple Watch
Sometimes my watch can't detect fitness equipment, how can I solve it, I have restarted, but it can't be detected
Apple Watch Series 3, watchOS 8
Question marked as
If it only happens sometimes, you should make sure Bluetooth and WI-FI are always enabled and you are not in Theater Mode.
About Bluetooth, Wi-Fi, and cellular on your Apple Watch - Apple Support
Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
Use Control Center on your Apple Watch - Apple Support