For the past few weeks, i have had trouble connecting my Powerbook (15" Alu, 1.25ghz) with my D link router (DI 624); after my computer has been asleep or away for a few hours, i come home and try to connect and my computer tells me there was "an error joining the selected network", despite it being displayed on the airport menu of available networks; on the flip side, i am easily able to connect to my airport express module (which i use primarily for streaming itunes) at any time. I have changed out the router for a new one, but the problem persists. the only way i can fix it is to unplug the router for a few seconds and then plug it back it in; my powerbook then easily joins the D link network. This is strange considering i have been using this router for several months previously. 