Log into the hub and see if the 5GHz signal is still enabled and if the SSID (network name) has been changed.
Set the network names for 2.4 and 5GHz to what you want - with, say, a 2 and a 5 on the end....
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I know a bit about Wi-Fi, Telecoms, and TV as I used to do it for a living but I'm not perfect so don't beat me up... If you make things you make mistakes!