@Matthewphibben to stream video you need sufficent bandwidth and a steady delivery of data. If you are using a device connected by WiFi thecsignal from your hub is not delivering that. If itsxa recent issue and it wirked before the issue could be unterferencecfrom a neighbour's WiFi if you suspectvthe try restarting your hub which will mskectge unit find the keast congested WiFi channel.
However that can be a short-term solution long term think about using an Ethernet cable or imoroving WiFi in your home you could buy Sky's solution https://www.sky.com/help/articles/sky-wifi-max or buy your own kit.
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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
