For several months, I've tried without success to find a solution to this issue on several forums . Perhaps someone here can help me. Here's my frustrating story: I was using a self-built machine. Suddenly random USB device-like (but not exactly) disconnect sounds started occurring (sometimes severalx in a row, other times not for several hours) - I disabled all system sounds and it still continued, even though I didn't notice any USB hardware blips). Two months ago, I bought the new Intel NUC7i7BNH, installed Windows 10, and within a few hours the issue suddenly started all over again. I recorded an occurrence of the sound. Here's the link: I have replaced or swapped out literally all my hardware, disabled all Windows power-saving settings, turned off ALL Windows system sounds, tested the same configuration on ***3*** different computers (1 running Win 10, the others Win 7), been on several computer help forums, pretty much eliminated every computer-related fix Google (and several computer advisers) could suggest including testing all USBs and running USBDeview (with no hits) - and the same "disconnect" sound (or whatever it is) continues. I checked the circuits in the room and changed the wall outlets. I even connected the PC to an extension cord on a circuit in another room. No difference. It's definitely coming through the speakers b/c I can lower the volume. I get no hardware hiccops.. The randomness is what is really frustrating. For instance it was silent all yesterday morning, then 3 times in a half-hour, then nothing until this morning - just once - and then suddenly nearly a dozen times in 10 minutes. There is just no pattern - no particular change in electrical usage - and the sound cannot be controlled or even disabled in Windows. The events viewer never shows anything that corresponds to the sounds. Right now, I'm using both a battery backup and a surge protector (both purchased since this issue arose). If there is some sort of electrical interference, shouldn't they shield it... or is there something else I can try (short of hiring an electrician to lay new lines)? To summarize... I'm looking for something that (a) sounds *like* the above sound ; (b) comes through the speakers (b/c I can lower the volume on it), is totally independent of anything I may be doing (or not doing anything) at the time; (c) is completely random. And mostly a way to disable it - before the sledgehammer comes out. *I would appreciate ANY direction as this has been very frustrating. Thanks!