My brand new Linksys WRT54G v7 router was dropping the wired connection randomly several times a day. I would see the Network Cable Unplugged notification bubble in the Windows systray for a second and then all my messengers and p2p apps would go down for a moment before reconnecting. I took the router back to the store and got a new one. And it too drops the wired connection! How come!? Edit: Just discovered it drops wireless too when it does.