Please try factory reset your earphones.
Factory Reset
To reset your headset, press and hold the volume up button, while the headset is charging, for 5 seconds. The indicator will flash blue 3 times, and all of the pairing information on the headset will be erased or reset).
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The sound is not very clear or the caller can not heard me clearly on a phone call.
My connection is not stable, it cuts in and out.