Sounds like radio interference. Wireless mice use a radio frequency that is very sensitive to the radiation from USB 3.0.
If you want the gory details see here:
http://www.intel.com/content/www/us/...nce-paper.html
You may find the problem goes away if you use a USB 2.0 cable to connect the dock (so that the 5GHz PHYs aren't activated), but you may object to the loss in performance.
Another possibility is to use an extender cable for the mouse transceiver to remove it from the source of interference.