System loses IP address

I have a venerable PowerMac G4-450 which will run for days happily, and then suddenly for no apparent reason, will revert to an IP address of 169.254.137.128. The router it is hooked to normally gives it a dhcp address in the 192.168.0.xxx range, but it loses this address for unknown reasons. No amount of renewing dhcp leases or fooling with the router helps. The only thing that seems to help is rebooting the G4, after which it will get its dhcp address and run for several days before this recurs.
This behavior started a couple of weeks ago; I have not changed anything except maybe some security update or whatever. It is currently running 10.4.11 and security update 2008-008. I can't find anything in the logs that is unusual. Does anyone have a clue what might cause this behavior? Is there some non-reboot way to get it running again (I run several server processes on it that I would really rather not shut down...) Is there some process I could hit with a kill -HUP or something to get it going?
Thanks
JEH

Not as a fix, but a possible workaround to the having to reboot... Sometimes having an all OFF Location can help, thanks to Gnarlodious...
http://gnarlodious.com/Computer/MacOsx/WiFi
Try toggling Locations next time it happens.

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