I recently began having an issue with my dgl-4500. My desktop has the dlink extreme pci-e adapter and it stays connected to the wireless network fine. So does my printer and iphone.
However, sometimes when i bring my laptop back from sleep it loses the connection to the internet. the popup asking where the network is comes up (ie, Home, work, public). and the network adds a number 2 to the name of the network (ie the network name "dlink" becomes "dlink 2". My roommate's laptop and desktop do the same thing as mine. My desktop is Win 7, my laptop is Vista, his desktop is Vista, and his laptop is XP. I have all the settings on default, except for changing the admin password and setting up WPA2 security.
I originally had 1.15 firmware, but just upgraded to 1.22NA yesterday hoping it would fix it. It didn't. I'm starting to get kinda mad cause this was a really expensive router when i got it (it's an A1) and has been working great up until a few days ago.