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This can happen if the remaining battery charge of the charging case is low. Recharge the charging case with the supplied USB Type-C™.
You can check the remaining battery charge of the headphones using the Sony | Headphones Connect app (Ver. 6.0.0 or later).
NOTE: For WF-1000XM3, the headphones firmware version 2.0.2 or later is required. Downloads are posted on your model support page.