Strange thing happened to me; I have a bluetooth dongle and headset. If I plug it into a USB3 port, it has a range of about 6". Fortunately my case has a pair of USB2 ports, and my MB has a matching header. When I wired those up, it works pretty much anywhere in the room. Since the BT dongle is a USB 2 device, I would have thought that the port would use the lower frequency and the EMI would be the same as a USB2 port. Not sure why it isn't.