I recently bought a refurbished airport extreme from best buy since I was in need of a new router I figured I would go with apple. Everything went fine and smooth the first few days and I was very happy with the speeds and connection I was getting compared to my old router. But then I would lose connection. The router is attached to a cable modem and the modem would lose signal. I'm not sure whether it's the airport that is contributing to the modem losing connection or whether its the modems fault. Now I never had this problem with the modem before. The message that I get from the airport is no DNS servers and a double NAT problem. Any help is appreciated.