I've just received an Airport Extreme base station, which I'm administering through the wired LAN port on an old iMac connected to the LAN prot on the base station. I'm routing my home DSL connection through the base station to the iMac, and have made wireless contact with a PC using WEP encryption, so things seem to be working.
Over the last 4 days I've had several instances where either the entire internet connection goes dead, or the base station stops working. In these cases the base station does not appear on the Airport Admin list when I run that utility. Some combination of either unplugging the base station or resetting has been necessary to reset. I'm running the most recent firmware I know of (5.1.1).
Any hints? Having to reset the base station daily is not acceptable!