I'm a recent PC to Mac convert ad have a few networking issues. I have an Airport Extreme and a Airport Express with a 24" Intel iMac. I use the Extreme as a connection ot the internet and connect the iMac wirelessly to it. I have the express set up to "extend the network" and have it connected via ethernet to my DirecTV unit (for on demand movies). Everything works OK for a period of time. After I return to the iMac after it has gone to sleep (and only sometimes) it will not connect to the internet. The one thing I do notice is the Airport indicator has changed. When things are working correctly it look like the image attached (it has a arrow that allows you to see other options). When I loose internet connection the arrow disappears. To get internet back I have to select Turn Airport Off and On. Then everything works fines. It's as if the connection has timed out and it refreshed by turning the airport on and off. Any suggestions? I'll be happy to post any other settings/screen shots that might help.