@laheca937nadir & @DJeff80 most common cause is poor WiFi dignal strength you can check this simply by going into the Network part of the settings. To stream livecsport in UHD requires a good steady WiFi connection free from interference.
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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
