Leopard unable to find preferred WiFi network after waking from sleep

This keeps happening sporadically - I have a WEP encrypted (would use WPA2, but roommate's old iBook can't use it) network with a non-broadcasted SSID. I've entered it into the preferred networks list as the only entry. About maybe once in every 4 or 5 times that I wake the system from sleep by opening the lid, it will fail to find my wireless network and the only way to get it to pick it up again is rebooting the machine. I've even had this happen while sitting right next to the router, so it's definitely not a signal quality issue...
Any ideas?
Ryan

FYI, I had the same issue with Leopard not remembering my preferred network, and tried every suggestion I could find from these lists -- to no avail. I filed a bug report with Apple, who responded by asking me to send a log file to them from my machine.
They wrote back, after having determined it was a keychain problem. To quote Apple:
"Please use the Keychain Access utility (in Applications -> Utilities) to attempt to repair your login and system keychain.
In the worst case, you may need to recreate your system keychain:
sudo systemkeychain -C -f
and then you will need to manually join your AirPort network once to write the password to the system keychain."
FYI what Apple failed to mention is that once in Keychain Access, there is a "Keychain Access First Aid" menu option that I didn't notice until too late. Brute force deletion of the login and system keychains worked for me.
Hope this helps (you and the hundreds of others with this issue)

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