I have had several problems with my home network recently, where parts of the Ethernet connected devices were not reachable anymore. The problem seemed to be a recently new 8-port Ethernet switch. Turning off and on one of the switch solved the problem for a while.
I figured out (after a long time) that the switch would fail when I disconnect my DELL DA310u USB-C hub from my Macbook. When I plugged the hub back in (even after hours), the network switch came back. Interestingly, the network connection from the USB-C hub to the failing switch is through another switch.
I found this article that describes a pause frame to be sent across the network from the USB-C hub. Man, that sucks....
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