I lost the configuration when the power supply is shut down

Hello, i have a problem with a linksys wireless model wrt54gs. When the power suply is off all the configuration is lost. How i can fix that problem?.

I'm having exactly the same problem with a WAP54G that purchased 2 days ago:
I set and used fine within 2 mins of opening shrink wrap. The next day we have a powercut. After power was restored the AP was broadcasting using its factory SSID and default WPA security setting. The Setup Wizard status showed the settings that I had entered BUT admin password was not recognised, neither was "admin" so I couldn't change settings.
I Googled for reset to factory defaults - 60sec press of reset with power on, 15sec power off. Setup wizard confirmed that factory defaults have been restored.
I then used the Web interface to configure - changed SSID, wireless security setting and admin password. Everything ok again.
This morning find that SSID and wireless security settings are set back to default but strangely NOT the admin password. There are no other signs in the house of a power outage, the AP has just lost some of its config.
What is going on?

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