@StMaurSKY0217 the most common cause of buffering when streaming video is poor WiFi signal to the device. People often assume thst if they have a fast broadband service to the hub the WiFi will also be fast which simply isnt true as WIFi signals are affected by the layout and type of construction in your home.
Check thst your hub is in the best possible place which is out in the open on a surface above obstructions like radiators. Do thecsame with the devices you are streaming - people often hide the firestick or Sky `stream puck behind a TV which blocks the signal as it contains metal. Beyond that you are into getting extra wifi 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
