Ethernet port stops working on location change

I seem to have a problem with my ethernet port not working after a specific location change...
I have three locations I used frequently. Let's call them:
1) HomeWireless
2) WorkWireless (used when I'm in meetings)
3) WorkEthernet (used when I'm at my desk)
My general practice is to change locations just before putting my MacBook Pro to sleep, and then it is happily ready for the desired network when it is awoken.
I'm not sure what this change in behavior coincided with, but as of ~1 month ago, I am finding that going from WorkWireless to WorkEthernet, my ethernet port appears to be completely dead and I have to reboot the computer to reactivate it (yes, I've checked the cable itself and the wall port at they're OK). I've tried a couple ways of disabling & re-enabling it in software, but I don't get the impression anything actually resets this interface - suggestions are welcome as perhaps I just didn't try the right thing. I couldn't find anything quite the same as "networksetup -setairportpower" for the ethernet port.
Oddly, this is not an issue with going from HomeWireless to WorkEthernet. Both HomeWirelss and WorkWireless have the ethernet interface deactivated in the Network pref pane, and perhaps the only notable difference between HomeWirelss and WorkWireless is that I use a static IP on the former and dynamic on the latter.
Does anyone have an idea why this could be happening, or have any suggestions for something to check (e.g. some difference to look for between HomeWireless and WorkWireless that might hint at the issue), or at the very least a means of resstarting the ethernet port without rebooting.
Thanks for any help,
-Gene

I'm still experiencing this issue. Anyone else? Any help on either understanding/fixing the underlying issue, or with resetting the Ethernet port to deal with it?
-Gene

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