@chriskfc if other devices in the same area connect normally try turning off the WiFi assist setting in mobile data settings at ghe very bottom as thatvwill switch to mobile data if its faster then your wifi.
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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
