I'm having a really weird problem with a voip headset (GN Netcom). I plug the unit in and it works fine but after 2 minutes or so it goes idle and just stops working... I had this problem on a PC recently but I was able to change settings in Windows Power management to fix the problem. The device is a USB device and unplugging and then replugging in the device fixes the problem - if you're on a one hour phone call and you keep having to switch the device on and off this can really get annoying though! Any ideas?