Thanks for checking. Its intermittent. When it happens i ring 150 and carry out the check which reveals no issues. It usually lasts about 1-2 minutes most of the time. I have checked for interference, changed channels, restarted and the problem continues at random times. Using the superhub in modem mode with Apple Timecapsule as the router.
Next I'd like to arrange for an engineer to take a closer look so I'm just going to send you a private message with appointment times which you will find if you click on the purple envelope at the top right of the screen.