@Ludders
It seems the broadband has a fault, this can be tested with the Sky App and an engineer booked if it finds the fault, otherwise please post your router stats when you have a black Sky Hub, there is a post at the top of the forum that explains about posting the router stats and broadband line test.
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Zen internet on FTTP (900Mbps down, 100Mbps up). SAT> IP (Apple 4K 2nd gen TV to LG C1 OLED UHD TV/Dolby Atmos Denon AVR, DacMagic Plus for Hi-Res audio), hosting own blog/forum (cluster), OPNsense & Zenarmor L4/L7 NGFW & DPI IDS/IPS, Asus ET12 Pro Tri-Band wifi, Linux, Gamer: Xbox Series X/i7 laptop, round-robin DNS over HTTPS, non-proprietary VoIP HD AMR-WB (G.722.2) and more... Beta tester Apple iOS/watchOS/tvOS/iPadOS/macOS. Dr Mae-03 PhD.
