One of my (three) WL500GX’s has a problem at power-up. If it has been without power for more than about 10 minutes, it comes up without PWR, AIR and WAN leds. The active LAN leds do come on. The router does not respond to pings from wan or lan.
If I now turn off power for a short time and then reconnect, it comes up normally, and everything works perfectly.

I have tried everything I can think of, clearing nvram with ‘mtd erase nvram’, reflashing bootloader, resetting to factory defaults, reflashing other firmware, both Oleg, OpenWrt and the special Clear-Flash-firmware, but nothing seems to help.

I just found a thread in Oleg's foræ dealing with this:
http://www.wl500g.info/showthread.php?t=4370
Has anyone tried that?

/PjK