I have just recently started having this problem. It seems when the computer sits idle, the connection drops. I don't see my network in the dropdown menu. I open airport utility, and the extreme base station does not show up. I find I have to unplug it, or do an actual reset on it to get it to show up. I try resetting the cable modem as well, but I have never had issue with the internet connection itself here before. I try restarting the computer. When it does come back online/show up in AIrport Utility, it seems kind of random because it will take a few attempts at all 3 methods mentioned before it just suddenly appears in Airport Utility. So I really have no idea what is helping. The process is a pain in the butt though. I have searched around, but I can't find many current articles on the problem. The only other info I can offer is that I never had any problems until I installed the last Airport Utility update. I am running 10.5.6. The problem doesn't seem to happen while I am working, and online frequently. I don't even know where to start trouble shooting. Anyone have any suggestions?