I have a desktop Mac (Mac mini) and on the same work desk a MacBook Pro. Between 2 pm and 5 pm GMT the wi-fi drops completely from my desktop computer yet stays at around 15 - 20 Mbps on my laptop. So the answer is clearly to use the laptop in the afternoons instead of the desktop. However I am racking my brains trying to work out why the wi-fi connection drops on my desktop computer for three hours every afternoon but not the laptop. Does anyone have any suggestions please?