@Russrimmer while it is possible its a broadband issue with buffering it sounds more like an issue with the TV. Poor wifi signal in your home is by far the most common cause of buffering when streaming video.
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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
