Ethernet Unplugged - AEBS voltage problems?

I've been having a problem for several weeks. Suddenly my Aiport Extreme started flashing yellow and saying "Ethernet Unplugged". I did all the reading anyone else had, tried a bunch of stuff and concluded my Ethernet port was fried. Here's what I've discovered.
It turns out that there is some kind of voltage issue on the WAN side of my equation. I bought a second Airport Extreme, thinking my WAN port was smoked. When I plugged the WAN wire into the new Extreme, everything worked. Old Extreme, I get Ethernet Unplugged. Worked for about a week on the new one, then I rebooted the new Extreme and kaput, nothing works. So ...
1) I tested the WAN connection to my Macbook - works great. I go out to the Internet no problem.
2) If I take a Dlink router, plug the WAN into that, plug another wire from the DLink to Extreme WAN, Airport is happy. Old Extreme ... same thing. Both are fine.
There is a specific sensitivity (voltage?) to the Airport Extreme WAN port that makes it say the Ethernet is Unplugged when it is connected to the WAN. That same WAN connection is perfectly fine connected to a DLink router or an Apple Macbook.
As an added bonus, my testing seems to confirm that when this condition exists, the Extreme also shuts down all the other router ports, as over wireless I can not access the other physical segments (i.e. my NAS). Yet if I my WAN is happy on the Extreme, the other ports work as well.
So in summary, I am convinced there are folks replacing AEBS' because of some sensitivity issue when the unit is inherently okay. I don't know what this fringe issue is, nor can I explain why a new AEBS worked fine on the WAN for a week, until I rebooted it.

Not exactly 'answered', but some newer firware version seems to have resolved this issue.

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