Thanks for coming back to us ATSimmo.
Can you please confirm if the hub is too hot to touch?
What we would also recommend is switching the hub off for 30 minutes - firstly via the switch on the back of the hub and then at the mains - this will allow the hub to cool down.
Please then reboot the hub and see if the red light returns on the router.
If this does re-appear, do please then try a pin hole reset to by holding a pin into the inverted Reset button on the back of the hub for 60 seconds to then see if when the hub reboots if the red light returns once again.
Thanks,
David_Bn