Hi, I noticed a few others having issues with no Internet from midnight.
I have a hub 3. I switched off power at the wall and checked all wires etc.
Once I powered back on, my hub lit up green, with the arrows flashing green also (occasionally red). This indicates an update. These can sometimes take over 30 minutes and the hub, wires, power etc should all be left alone until the update is complete.
This appeared to be the issue for me as all back up and running at the moment.