Are you running stock usb kexts or did you try to make USB3 work by running different ones? My understanding is that if you attempt to get USB3 to work with modified usb kexts, then you break certain usb2 devices... My laptop doesn't have usb3, so it is not something that concerns me.
Sometimes when waking from sleep, I notice that my external keyboard doesn't work very well (it misses keys 1 out of 10). When this happens, I restart. But that is the only USB glitch I see, and I think it may be caused by this ancient Dell USB keyboard I happen to have laying around.
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