@Mary2804 to stream video requires a strong wifi signal. In many homes you need more than a single wifi source to providecthst especially on different floors due to the layout andctyoe of construction of your home. Thecsolution is either to subscribecto Sky's WiFi Max bundle that can provide upmto 3 wifi extenders (see https://www.sky.com/help/articles/sky-wifi-max) or to buy your own third paety WiFi equipment.
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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
