Hello, I wanted to see if this was an issue that anyone else was having, no matter the carrier. Since I've had the device (a few months) I have had this issue - whenever I call someone, or they call me, I will be able to talk and listen for a few seconds, and every once and a while the speaker will just mute. I am unable to hear the person I am talking to, but they can still hear me. I will hang up and recall and then everything works. Thoughts?