Problems with connecting to internet after power loss w WRT54G v3

I'm having problems connecting to the internet after a power loss with my WRT54G v3 wireless router.  I'm at the latest firmware version (4.21.1). 
I found similar problems with the V2 version of this router. 
After a power failure, I can access the http interface to the router,all of my settings are there (not set to factory settings),the unit is connected to my ISP provider,I can ping from the router, but none of my wired or wireless PCs can ping.
To "fix" this condition, I have to reset to factory settings, then re-load my saved configuration.This usually works, but sometimes I have to hard reset the unit.
Anyone having this problem? Anyone have a fix?

Sudden loss of power for extended periods of time will 9x out of 10 will corrupt the saved configurations and can only be fixed in the way you already described.
 A solution for this is getting an UPS incase of a power failure your equipment will be on battery back up until either the battery runs out or power is restored (depending on the model changed the battery time)
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