@Gurjit I am not sure that you can apply on behalf of multiple cases as there may be multiple causes, but to contact them, simply email them at support.uk@tp-link.com, make a note of all the Deco kit...

So I have an update, I raised a support request and TP Engineering got in contact on Monday. They remoted in and did quite a bit of work to diagnose my issue and I am pleased to say that they got me...

I am also having the same issues post P9 firmware upgrade, random loss of wifi, but confrmed Virgin HUB 3.0 still offering IP connection. Also, Guest Wifi can sometimes still offer a wifi service...