@Cwentzel unfortunately as the over whelmingly most likely explanation is exactly as Sky support says I cant support your conspiracy theory. Why would Sky purposely swap a usable hub for a complete dog it makes zero sense.
Sky are gaving to swap out the older flat Sky Q hubs as they do not neet new regulations on security and are replacing these with the Sky Broadband hub which until recently was often supplied as a paid upgrade. The new model normally has greater wifi range but wifi coverage is affected by location of the unit - make sure it is out in the open and on a surface so its above obstructions like radiators.
It is possible you have a dud example which are rare but Sky will swap it out if you. Co-operate with them.
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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
