I am in in Home 500 plan. Issue is if the internet if left idle for say abt 20 mins(say i am off the computer or doing nothing) then the internet gets disconnected. This is very irritating as i cannot go to sleep without setting an alarm in my download manager. The download would not start as by 2:00am the connection would have disconnected. Is there a setting in my modem that can be tweaked to fix this Please help