My modem gets disconnected every time I switch the computer off. I come in the morning, put the computer on and when trying to connect (BT broadband) the window tells me: Opening port. Error 797. The modem was not found or was busy. All I need to do is unplug modem and plug it back in and all works, I can ask to be connected to broadband and I get the connection no problem. In the evening I switch the computer off and the next day the same story repeats... This just started some weeks ago, I do not know why. It is a nuisance to do this 'unplug, plug in' routine daily but also I worry that the computer (or modem?) may not like it in the long term... Any ideas, please.