@Ranj171 if by the term "new briadband Sky box" you mean the white Sky Max hub then therecarecfhanges to how thst connects to Sky Q TV boxes. Unlike the older black Sky hubs the new hubs are not compatable with the WiFi mesh system Sky Q uses. The Q minis cannot normally connect to the new hub instead you connectvthe main Q bix to the new hub and then connect the Q minis to the main box. If your main Q box is further from the hub than the Q minis you can hit issues.
This page explains the steps https://www.sky.com/help/articles/setting-up-sky-q-do-you-have-a-sky-hub
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65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
