To whom it may concern, I've now purchased 2 mophie chargers for my iphone and both seem to have had the same problem. They work great for a certain time period (6-12 months) then stop working properly. Im not sure if they are taking a charge or not but when it trys charging the phone itself (when charger is unplugged) it will just charge for one second then stop and create an annoying buzz sound over and over. Can I get a replacement unit sent to me? Please adviser, thanks!