Presuming this is a wifi issue rather than a problem with speed to the hub, firstly, unplug the hub for 10 minutes and then reboot.
Have a look at the following to see if they can resolve your problem easily if no success with the above, you can also use the MySky app. If not you may need to consider either the Sky WiFi Max add-on package or perhaps purchasing a 3rd party mesh system (which remains yours regardless of ISP used and would be my own personal choice).
********************************************************** Not a Sky employee ********************************************************** Sky Q with 2GB UHD box wired to the Sky Max router Samsung S95C TV, HDMI to Sonos Beam Gen 2 Sky FTTP 500Mb to Max Hub (WiFi disabled) Pair of TP-Link Deco BE65's in AP mode used for WiFi access with MLO enabled, main Deco hardwired to Max hub
