Run the broadband diagnostic first either online or via the MySky app and click the wifi option when it's finished. If everything comes up as OK then have a look at the 2nd link to see if that helps. If possible, an ethernet connected Q box is always preferable though.
https://www.sky.com/help/articles/broadband-diagnostic-start
https://www.sky.com/help/articles/broadband-tips-when-working-from-home
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Not a Sky employee
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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, main Deco hardwired to Max hub
