Do a pinhole reset to factory settings. With the Hub "on" push in the pin on the back/side/bottom of the Hub with the end of a paperclip until you feel it at the “stop point” and hold for a "timed" 60 seconds do NOT restart the Hub after that. Your passwords/passphrase for both the Hub settings and Wifi networks should revert to the two printed on the Hub sticker on its base & card in the drawer. If that doesn’t sort it - call it in as faulty.
-------------------- Services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired 2 WiFi,) SH2 in modem mode with Airport Extreme Router. On VIVID200, Talk Anytime Phone, x2 Mobile SIM only iPhones.