Can Apple check the sensor on my Apple Watch?
My watch keeps pauses every 10 seconds. Can support test to see if my sensors are working properly?
Question marked as
Shortly after starting a workout, you should see the green sensors underneath the watch. See the 'How Apple Watch measures your heart rate' section in:
Monitor your heart rate with Apple Watch - Apple Support
Your best option may be to make an appointment at the Genius Bar in an Apple Store near you and let them look at it:
Genius Bar Reservation and Apple Support Options - Apple