Yea my guess is that the issue is a ROUTER problem. It just so happens that when your internet drops and comes back on, your router does a little bit of housework and probably messes with the DHCP settings in some way, shape, or form. Honestly the most important piece of information is Make/Model of your router. Knowing most people, my bet is that you probably have a Linksys WRT54G v4 or v6 maybe...but that's just my guess! Please prove me wrong! LoL