My PowerBook will randomly lose the ability to access the Internet. It usually happens when I wake it from sleep, but not always. The AirPort signal remains constant at three bars. Internet Connect shows no problems, and it's obvious that the router can see the computer and vice versa, but attempted connections with iChat, Safari, and several Dashboard widgets start and time out. I've also run Network Diagnostics (which is practically worthless, IMHO, but that's a discussion for another time) to no avail. Turning AirPort on and off repeatedly also has no effect. The only thing that fixes it is a hard reset of the router (Linksys WRT54GS). OS X restarts don't help, and neither does putting it to sleep. The connection will sometimes come back on its own after a couple hours of doing nothing, but that's very rare. The modem settings all look fine, and the only thing I've done on the router since initial setup is add a port forward for Azureus. I've been having other issues with OS X in general since 10.4.8, and others have told me it's probably time for a clean install. However, I'd really prefer to wait until Leopard's release to do that. It should be noted that this does NOT happen with my Comcast internet down in Chicago, so that makes me think it has to be something with either this router or Road Runner. When it first started happening, I thought it was RR's DNS servers acting up (which they have a tendency to do anyway), but I don't really think so now. Any thoughts?