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Hi there.
If it's a very high-pitched noise, it could be that it's present in others' devices but they can't hear it.
That being said, I'm usually very sensitive to such noises, and I've yet to hear one come out of my DXG. Sounds pretty annoying; personally I'd contact CS about it just in case it is a known symptom of some more serious problem with the device.
Good luck!
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