Thunderbolt ethernet adapter causing buzz within MBP.

I've noticed something very weird lately with my retina MBP. Whenever I'm loading largish (> 1mb images) files in the browser, my laptop emits a noise that sounds like there's a tiny little buzzer somewhere inside the laptop. It lasts as long as the file is loading onto the page or downloading in the background. I've been able to reduce the problem down to only occurring when I'm plugged in using a thunderbolt ethernet adapter. On power, off power, connected to external display or not, the noise is present. I would really like to stay connected to ethernet, but I have no idea where to begin fixing this very weird problem.

I bought a new adapter but this one doesn't work too! That's €29 well spent
So anybody got any clue what to do? It shows up in the system info, but there is no thunderbolt ethernet interface available in network settings...

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