Hi. I have had flawless BT infinity broadband forever with Hub3. I told everyone 'go with BT they're great'! . Then about two months ago wifi started dropping out occasionally. It has steadily deteriorated and in past 24 hours I can't connect any device to wifi. Have reset, restarted hub etc. No joy. All checks say there is no problem but there clearly is. Sky still working On Demand services. Devices which won't connect ' can't find server' are iPhone 6s, MacBook Air and iMac. Anybody any ideas? Thanks in advance.