@Lorraine1991 most likely explanation is that the TV is not getting enough WiFi signal. If you use Netflix there is a useful network test in their app's Get Help menu. You need at least 25Mb/s to stream in UHD less for HD. While you mmay get an improvement with acsimple WiFi extender which can come as part of Sky's WiFi Max bundle (see https://www.sky.com/help/articles/sky-wifi-max) there can be other solutions if the TV is in a poor place for WiFi in the past I used a powerline networking kit as my TV had this issue, these kits use the mains wiring to carry the data.
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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
