Agreed it sounds to me like mlmclaren has a faulty device.
My house is as follows
2 android phones
A wireless printer
A smart TV
We are always streaming 1080P on the smart TV and ps4 without any drop outs what so ever.
Sky HD Box
7 laptops, a mix of OSX, Windows 7 and 8, 10 work and personal laptops
iPad x 2
Apple TV 3rd gen
Not had any drop outs on any device using the smart hub. Signal and range is better than ever and actually since a firmware upgrade appears to be beating my HG635 which initially was the winner.