Same Issue here with Microsoft Surface Laptop 2 and the Docking Station. 2 Screens on Displayport, Ethernet cable, USB Mouse, USB Keyboard and USB Stick. The Problem occurs on a regular basis.
When docked, the laptop is running whilst laptop screen is closed.
Sometimes it occurs that the signal from one of the two screens is lost and only a full reboot of the laptop solves the issue temporarily (yes I've tried to plug / unplug, turn the docking station cable around, exchanged all display port cables and plugged the docking station directly into a power socket so that no power extension cord is in between).
It happens often that the signal of mouse and keyboard are lost / like the USB/Ethernet ports are getting reset.
I kind of must agree with the fellow users here. It is very frustrating and makes the laptop & dock almost unusable! (plus the dock only 2 months old)
I would be very grateful if Microsoft could come up with a swift (&permanent) solution.