Looking for some tech advice again.

Anyone of you familiar with DLINK 2640T? I got it the other day and noticed that after a long period of inactivity (usually a few hours), I can't seem to get onto WWW. But the modem says that I'm connected to streamyx and the web browsers says that the internet page cannot be displayed.

The DNS settings didn't change. It's on the LAN settings so I'm guessing it's something on the modem itself. When I set it up, I was using the Setup Wizard and got connected to streamyx that way. UserID and password are put into the program.

Any suggestions guys?