Yeah I have the exact same problem, I don't think this is related to the lightning strike because I didn't have one here.
We have two devices connected to the Hub3 via ethernet and both are not accessing the internet. It is as if they have been blocked. It happened for the first time yesterday I noticed that our smart heating system was not connected to the internet. I reset the route which seems to solve the issue temporarily because this morning we have the same issue. Alongside that our Apple TV box does not stream when connected via ethernet but will do when this is dis-connected and it is connected by wifi.
I wonder if there has been a firmware update or something else that could have changed the settings? I don't often have need to access the route itself and haven't done this for along time, both devices have always just plugged and played.
Any suggestion gratefully received.