WN2500RP Resets itself

[D2K1]

As the title implies, my Wifi Extender randomly resets/restarts itself.

So far it occurred three times, but not in a pattern.

However when that happens I can't connect to the Extender (Using a Device) because of "Authentication Problem"

This is becoming very annoying because it happens when you least expect it... 

[TheEther]

Is there any possibility that someone is pushing the factory reset button or logging in and erasing the settings?  Try changing the admin password to eliminate the latter.

[D2K1]

I'll change it, however no one has touch the extender but Extender Network is secured with a password. [WPA/ WPA2 PSK]
If it's possible that someone can get access into network & the Extender then that's a problem