It doesnt happen with my headset plugged into any other machine, and also, when i use something else to power the headset, i cant get it to do it. so it has something to do with the USB port powering the headset. i think. Also, if i use the computer to power the headset but stick the stereo jack into my phone i dont hear it, and if i plug the usb into another machine or staright into the wall using a usb to wall jack it doesnt do it, so im not sure whats going on. it sounds like an old school printer going really quietly.