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Thank you for reaching Microsoft Community.
Please try first updating your Surface Earbuds and test again if the issue persist. See this page for details to Update Surface Earbuds.
If in case the issue persist, please proceed in doing a reset on the earbuds to factory settings (Reset Surface Earbuds).
If still the issue persist even after the reset, I suggest to contact support for options and for further assistance. You may contact support through this page: Contact Us or through our Global Customer Service phone numbers.