@Martin603 reboot your Sky hub as a first step. Loss of download while upload is connected is a very unusual fault but you could get that result in a trst if a devicecis using yhe bandwidth for a large download like an update.
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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
