I installed a D-Link Di-524 wireless router. My internet connection is a cable modem.I have two computers connected to it. A Desk top computer is connected to the first wired port. My IBM Thinkpad connects thru the wireless connection. My desktop computer is always on. But if I leave it idle for more than 30 minutes or more, when I try to connect to the Internet I need to restart the computer the re-establish the connection. After that, there is no problems. I can use the connection as long as I want. It will always be on as long as I use it . If I leave the computer for period of time, I will have to restart it again. What can be the problem?