One of the more weirder network-problems I just debugged: I have a USB-C-dock and the dock has a USB-C-port to which an Anker-USB-C-ethernet-adapter is connected.
When the laptop disconnects, the adapter has still power because of the dock and creates some kind of traffic and does something to the switch to which it is connected. Because after a short while the WLAN in the room breaks together. You can still connect to the WLAN but you won’t get an IP-address and even assigning manually one, won’t help. Now I am really curious what happens there. Unfortunately it is a managed switch. But maybe a tcpdump of a device connected to switch might still bring some light into the dark.