I'm not sure exactly what is causing the problem, but I was thinking that it could be a virus. After I step away from my computer and it goes on stand by when I return it will no longer have any internet connection and when I try to send email it will say "server not responding". In order to get my connection back I need to restart the computer and boot it up again and then it works fine until it goes back to stand by. Is this a virus or just something wrong with my router or ISP?