I bought these yesterday, I'm using them via the 2.4 USB radio adapter in my PC. There is a continuous, mild whining sound from the headset, that stops a few seconds after any audio stops playing. It's present always during playback of any sound / music, and 3-4 seconds after the sound playback stops (like a song ends, or I pause a video), the whining is gone.
This is in cotrast to my previous headset, Cloud Flight S, which has no such issue.
Is this a common experience? It's really hard to bear, as it's this quiet, but persistent high-pitched noise that keeps drilling into my brain... 🙁