WRT54G: Static mode set on WAN side, but still sometimes pulls address via DHCP!

We've had (6) WRT54G (v5) installed in a building, for about (2) years now, with no previous problems. Now, ALL of them are doing something weird.  They are all set for Static mode on the WAN side (we have static ip addresses for these), yet every now and then they will spontaneously pull an address via DHCP on their own.  When they do this, the setting itself doesn't change.  It will still show "STATIC" in the pull down list.  But, the address will no longer be the address we assigned to the unit, and will instead appear to be an address that it pulled via DHCP.
Thanks, in advance, for any help and insight into this strange problem.
David

Ah.  In that case, we're not going to put our client through the frustration of chasing a ghost in the machine.  We'll just replace them with new ones.  But, I'll try this on them in my spare time and let you know how it goes.
Thanks for your assistance,
David
Message Edited by ld-systems on 09-19-2007 08:01 AM

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