Hi David, I am Dexter, an Independent Advisor, here to help you.
From the information you provided, I think it's still due to the receiver's driver, I'll suggest you try to roll back (if possible) the receiver's driver, otherwise, you could plug the receiver to the USB port on the docking station, it won't influent the performance because I/O device only cost negligible performance.
I hope this helps. Feel free to ask back any questions and let me know how it goes. I will keep working with you until it's resolved.