Airport sometimes does not see network
Recently, I have had intermittent problems with the Airport connection. Have a PC desktop connected via wire to Netgear router. My PB (10.3.4 -- all updates, etc.) uses the Airport Extreme card to connect to the internet via the router. Lately, maybe once a day after I have turned off Airport and closed the lid on the PB to sleep it, when I wake the PB and click to turn on the Airport, it does not show the network name, so I choose "Other". When I try to set it up that way, I am told that the network "Name" can't use the WPA setting (that IS the way we have it set through the router). I am totally unable to connect. This does not happen each time it sleeps and then wakes, only sometimes. Sometimes, if I wait a while and try again, it will come back on its own, and sometimes I have to reboot in order to connect. Anyone have any ideas why this is happening, and what to do about it? I do repair permissions (did so yesterday, as a matter of fact), and run Panther Cache Cleaner, so feel like the system should be "clean". Thanks in advance for any help.