Very Disconcerting Issue Happened with my WRT54G

Does anyone know what would cause my router (WRT54G) to reset to factory defaults just out of the blue?  I did not touch the reset button at all.  In fact, I was on my laptop in another room when it happened.  I lost wireless connectivity and while troubleshooting it, I discovered all of my settings had been reset.  Even the password to access the interface into the router was reset to factory default.  I was able to fix everything, but I'd like to know what caused it.  
At first, I thought I may have been hacked, but I have a very strong key phrase set with WPA2-PSK encryption.  I also have enabled the MAC filter and only permit access to the PCs I have listed in the MAC filter list.  Fireware is also up to date.  
I know it's still not impossible to hack, but I can't see anyone with the type of knowledge to beat those security features wanting to hack into my network.  
Are there any other reasonable explanations of why this happened?  
EDIT (I forgot to add 2 things):
1 - There was a power outage here earlier in the day, but I had connectivity for at least an hour after it came back on, with no issues.  
2 - Right before this happened, I started getting 'A duplicate IP address has beee detected on the network'.  This one was really strange because the router hands out the IP address via DHCP.  Why would it give out one already in use?
Solved!
Go to Solution.

It was probably because of the power outage. You can either keep a backup copy of your settings through the backup and restore tab or use a surge protector to prevent your router from losing those settings in case another outage happens.
The duplicate IP issue was probably because of the outage as well.

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