I believe you have the problem that James refers to. The USB 3.0 traffic to the dock is causing interference that your Wifi card is picking up and slowing down the network transfers.
A way to check is to swap from a USB 3.0 cable to a USB 2.0 cable and see if the problem goes away. If it does, then there is USB 3.0 interference coming from your dock.
Wim
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