I have read on here from time to time about people complaining about a rattling noise coming from the top, near the speaker hole. I would have never noticed this without shaking it, but sometimes when im making a call it sounds muffled too. I dont know if I should go back to the ATT store and try and exchange it? Since it is only 2 weeks old? Please let me know what I should do, specially if you had this similar problem.