Not USB specific but I was having a hell of a battle with the box waking up shortly after suspend. I went into advanced power settings and disabled everything I could think of, Hybrid Sleep, Allow wake timers etc. I traced it to the Netgear "Genie" software. By default it was loading with Windows and residing in the Systray. Disabled it from doing that and exited the programme entirely after use. Job done, in the end I uninstalled it as I hardly used it.
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