@HarassedMum after midnight there could be essential maintenance work being done in the network which means the hub is connected to the exchange but no data flows. If so your connection should be back by mirning. If it isnt and the service checker in the My Sky app run overca mobile connection is not telling you Sky are aware of a fault do you need to contact Sky.
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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
