We recently got the LG G2 for my husband. When speaking with him, his voice is not always clear during the conversation. He will randomly sound very muffled, as if something has partially blocked the microphone. At other times he will sound completely clear. He says that he is not moving or doing anything to change the position of the phone. Is there something about the LG G2 that causes this to happen so that we know how to avoid it in the future? Thank you for your help!