[SnoopZ]

If the hub3 has a flashing WiFi light then that is strange as the only light meant to be on is the white bar at the bottom of the hubs in router mode.

As already suggested connect the hub3 direct to the windows 10 pc in modem mode turn all off and on again then see what happens, if you don't do this it makes your problem difficult, this will remove your other stuff from the loop.