I have searched for a solution to this but my problem seems to be a little different. I had standard Plusnet broadband and never had a problem. I recently had Fibre installed and of course that is different hardware. I connect with a LAN to my main pc and get really good speeds. The trouble is with wireless connections; good signal and phones and laptops report connected to the router but I still get "no internet access". Just occasionally I do but at the moment nothing. Very frustrating!!
I have tried rebooting the router and laptops and phones but no better. Any clues anyone? Could it be a fault with the router??