This may be caused by environmental interference or issues with the device's Bluetooth signal during the call.

1. If using only one earbud for the call, ensure the other is in the case with the lid closed.

2. Move your device closer to the earbuds to see if it improves.

3. Try making calls with a different device to see if it improves.

4. If using a third-party app (not the phone's system phone app), try using the system phone app to see if the issue persists.

5. Test the earbuds with different Bluetooth devices in different environments to see if there is any difference.

If you encounter any other issues or your issue has not been resolved, please contact us for further assistance.