Brian has an Apple Airport and every time he gets on the network with his phone, the internet drops out. Leo says to check his DNS to see if it's properly configured. That can be found in network settings. He should also try rebooting his router. Steve Gibson has a tool called DNS Benchmark at GRC.com which can tell him how well his DNS settings are responding. He can also change it to Google's DNS or OpenDNS. It could also be that his router is just dying out.