Excellent value for Lenovo's ThinkPad docking station. New unit with all the ports you'd expect from an Ultra Dock. The only knock on this new design is that it is not as solid a connection as the old docking station with the connection made to the bottom of the laptop. The Plugable USB 3.0 Universal Laptop Horizontal Docking Station for Windows (UD-3900H) allows you to add dual monitors, and connect your peripherals, all through a single cable back to your laptop. Quickly come and go from your desk with ease.
Answer: This problem is caused by interference in the 2.4 GHz band. A possible solution is that you connect the docking station to the Mac’s Thunderbolt 3 (USB-C) port on the left-hand side closest to you or that you use the ports on the right side. These ports are located farthest from the WiFi antenna.