I have this as well, mostly it seems when I'm doing a lot of stuff at the same time.
What seems to help is to disconnect, wait a couple of seconds, then reconnect the dock. I In my case it is a Kensington SD3000 connected over a USB 2.0 cable to a Dell 6430u Laptop with Win7x64. USB 3.0 cables don't work, except for a brief moment when I was de-installing the DisplayLink SW to do a clean reinstall. Somewhere during the installation process a USB Driver gets overwritten that causes my USB3 to fail.
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