I have the same problem. I have four headsets all of them are Plantronics edge. They have the same microphone issue. Plantronics replaced 2 of them but the new ones went bad after 2-3 months. It has to be some kind of manufacturing defect. It's better to stay away from that headset. If anyone have this problem is better to send it back and ask for refund. I went through 6 headsets and they just die at some point. So the new one will not be any better.