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Thank you for reaching out. I can certainly understand your concern with your watch sensor not functioning as expected. The first step I would recommend is running diagnostic on your watch via the Members app. If you are unable to use the members app the first step, would be to try the troubleshooting steps in this link for the step count not working: https://us.community.samsung.com/t5/Galaxy-Watch/Galaxy-Watch-4-Classic-46mm-not-tracking-steps-or-w...
For the ECG sensor not working, we have actually put together a specialized team for all ECG related products. If you're unable to get the application to work properly, and all other features of the watch seem to be working correctly. We'd like for you to contact our specialized team to check this out, and go into some further details about your experience and what you're seeing.
This team is available for calls Monday Thru Friday 9AM-6PM EST.
1-855-795-0509 option #6
Alternatively you can also reach this team by email:
If you reach out, please make sure to provide your Community Username to the ECG Team!
I see you also stated that your deep sleep has been off. Please give this link a try for Inaccurate sleep data: https://us.community.samsung.com/t5/Galaxy-Watch/Galaxy-watch-series-Inaccurate-sleep-data/td-p/2260...
If you have tried all the troubleshooting steps, such as submitting an error report, resetting the watch, and contacting the Samsung Health team, the next step would be a service repair.
For in-warranty repairs: Please feel free to reach out to us directly via one of the following options and include a link to this thread.
1. Facebook Messenger: http://m.me/samsungsupport
3. Or you can use the following link below to request service. https://www.samsung.com/us/support/service/
4. Private message: https://bit.ly/3fbRevo
5. Contact customer service directly at 1-800-726-7864
For out of warranty repairs, please give this link a try to set up service for your buds: https://www.samsung.com/us/support/service/locations/ or you can reach out to our customer service team directly at 1-800-726-7864.
For international devices, please reach out to a support team in your area for further assistance: https://www.samsung.com/us/common/visitlocationsite.html