I've had my Moto X for about a week now, and over the last couple days I've had a few people say that my voice is chopping in and out on calls. Or going from really quiet to really loud. I don't have an issue with hearing the other callers - everything is fine. I have great LTE reception and strong wifi signal at my office. Anyone have any experience with this? Thoughts on a fix? Some weird setting I should adjust? Thanks.