Has anyone figured out why their A50X has a buzzing noise?

It's my second pair, I sent back the first one because the dock died for no apparent reason just two days after I got it. I was already experiencing a buzzing noise with the first pair and thought it was an issue with the dock, but once again, I'm having issues with the constant buzzing noise.

The noise isn't that loud, but it's audible enough to give me a headache after an hour of wearing them.

I'm really in love with the headset though—the sound, the microphone, all the dock's features. It’s been a while since I had a good headset, despite the obvious issue with the white noise/buzzing...