I have found out why devices especially my laptop keeps dropping it's Wi-fi connection.
The 5GB connection on the BT Hub has a hard 5 device limit, if you have more than 5 devices that use 5gb trying to connect, the 5th, 6th , 7th etc device will fight over the last connection.
the 2.4gb connection seems to have a much higher limit.
I'm a Mobile Device IT Engineer so it was in my nature to find the root cause.
I would have thought a mobile device IT engineer would know the difference between 5GB, 5gb and 5Ghz