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?
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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