@Broadbandspeed what spedd does the Service Checker in the My Sky app report? If you click on thecresult it should give the history for the last couple of weeks. If it is lower than the guarantee it should offer help or you can ring Sky. If thst looks ok then the ussue is between the hub and your devices which can be down to interference if you are using wifi.
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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
