A few things to check, (1) Turn off all but the master discs connect to the Whole Home Wi-Fi and check you have the latest firmware using the app then complete a speed test, you should have the same or near to the HUB's Wi-Fi speed. If its ok then turn on the rest, wait for a solid blue LD on each, then using the App go to HELP > Email and click SHARE, this will build an email to send to the helpdesk. (don't send it yet) have a look you should see in disc Detail the signal strength at the end of the dis detail. if it’s in the -80's you should try repositioning the discs. Still have a problem add some detail to the email above, detailing the problem and send to the BT Helpdesk, just remember to confirm the HUB type in the mail.