Hi, My name is Eric Moyers. I am a Network Support Engineer in the Cisco Small Business Support Center. Thank you for using the Cisco Community Post Forums.
Did you upgrade to 2.0.4.2 or did it already come with that firmware? If you upgraded the device did you do a factory reset and manually reconfigure the AP?
If not, please reset the unit back to factory defaults. Then manually reconfigure the unit not copy the config file back in.
Sometimes we have found with some devices and firmware that the configuration backup will keep some of the old code with it.
Manually reconfiguring the unit will assure that we are totally using the newer fw.
Also just for testing purposes, please try using a slightly shorter password or try adding the SSID's one at a time. Do the first one and then connect, add a second one and then connect, etc.
Please let us know if you how it goes.
Thanks
Eric Moyers
Cisco Network Support Engineer
CCNA, CCNA-Wireless
1-866-606-1866