I leave my desktop on at all times. It uses the internet via cable, not WiFi. 3 days, or so ago, it started this behavior, when not used for a couple of hours it disconnects from the internet. When I try to reconnect it only gives me the option of dial-up or WiFi. It also checks "Work Offline" by itself. I have to un-check "Work Offline" and reboot to get an internet connection again. What gives?