@Loulou42 sounds like your hub has lost the connection to the exchange. If axsimplr rdboot and check of the cables doesnt help suggest you run Sky's online Service Checker in the My Sky app over a mobille connection. That can take up to an hour to pick up a lost connection but oncecit does it can walk you through a few checks before booking an engineer if the fault has not already been reported.
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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
