Have you tried the pinhole reset to factory settings without turning off ? Push the pin in firmly till it "stops" and hold for a timed (not guessed) 40 seconds – don’t turn it off. This has sorted the same issue for a number of people over the last few weeks.
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John
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My 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.