Unable to use ethernet after updating to OS X 10.10.2

I updated my Mac Mini (late 2012) yesterday from OS X 10.10.1 to OS X 10.10.2.
After I updated, I noticed that under Networks in System Preferences, OS X indicated that I had a cable unplugged for my ethernet connection.
I checked the cable and even replaced it.
This did not fix the issue.
I tried rebooting a few times and ethernet seemed to become available, but if I used it, after a few minutes the system would seize up and reboot on its own.
This did not fix the issue.
I've deleted my location profile (under Network in System Preferences), shut down my Mac Mini, booted back up and tried creating a new location profile, but there is no longer an "Ethernet" interface available to add to my new location profile. I do however have both a "Thunderbolt Bridge" and "Thunderbolt 1" option in the list of available interfaces. I think this is a bug, because when I try to add the "Thunderbolt 1" interface, it doesn't appear in the list of interfaces for my current location.
This did not fix the issue.
I've re-installed OS X 10.10.2 twice using the full installer downloaded from the Mac App Store: once from the Mac Mini itself, and once from a USB I created.
This did not fix the issue.
My Wi-Fi connection works fine, but ethernet is no longer available.
If I shut down my Mac Mini and try to boot manually with the ethernet cable connected, sometimes it will refuse to boot, or will boot but will stay stuck on the grey boot screen with no Apple logo and no progress bar visible.
How can I re-enable ethernet?

Update:
For no apparent reason that I can think of, I began having connectivity issues over Wi-Fi; but only with certain applications such as Safari, Mac App Store, Google Drive, and Steam. Google Chrome was completely unaffected. I was also able to use Microsoft Remote Desktop over LAN without issue, and the Windows computer I would connect to didn't experience any internet connectivity issues.
Not sure why this was happening, I restarted.
After a few minutes following the restart, OS X froze like it used to before.
I reset the SMC.
The system would keep freezing after a few minutes.
I booted into safe mode and saw the Ethernet interface was now again listed under Networks.
I then restarted and tried to begin the AHT, but the system freezes completely after a few minutes every time I start testing.
I gave up trying to perform the AHT and booted normally.
The system would keep freezing after a few minutes.
So I eventually gave up and had to delete the Ethernet interface from Networks.
Now OS X doesn't freeze, but I'm back to only using Wi-Fi again.
None of this fixed the issue.

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