I've had my SuperHub 3.0 for a long time now without any issue. However, for the whole of December so far my ethernet connections will intermittently drop out, sometimes for a period of hours.
I've been using a wired connection with my Xbox and Powerline adapters for some time without any problems. When this happens the WiFi continues to work perfectly.
Restarting the hub doesn't resolve the issue for more than a minute or two.
I should also state it's not the cables or the devices that are problematic because everything connected drops at the same time.