Is it like a "sizzle" sound based on wireless activity?
Could be inductor/coil noise - https://en.wikipedia.org/wiki/Coil_noise
Mostly harmless if not annoying in a quiet space...
This issue has been disscused many times in the Netgear forums since the 7000 was released some do it some dont. Netgear has said its no issue and ignore it.
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