@Clara1210 do you actually mean the wifi connection from the hub to your devices stopped working or more likely your hub lost its Broadband connection? They are two quite different things. The lights on the hub can tell you which it is and this site can tell you what to do https://www.sky.com/help/articles/hub-lights-explained-start
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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
