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Hello, and thank you for reaching out! We are sorry to hear you are experiencing issues with the audio during calls. Please note that the sound may be disrupted if signals are blocked. Ensure you do not fully cover this unit with the palm of your hand, etc. Furthermore, make sure the device is not out of the 10 m (33 ft) communication range. In such situations, we advise switching off any wireless LAN device when not in use. If the issue persists, you can restore the unit to the factory settings and delete all pairing device information by pressing and holding the power button for at least 7 seconds until the LED indicator lights alternately in blue and red while the power is turned off, then release your finger from the button. The next step is to press and hold the power button and " + " for at least 5 seconds. When pairing the device again, delete the registering information from the Bluetooth device's menu and register this unit with the Bluetooth device again. Hope this helps! -C
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