Hi. Last time i checked ( today, 17.09.2020) it didn't made the noise while the USB cable was unplugged , but after i plugged it in, it started to do the noise. I think one of the problems can be interference when the USB in plugged in. I will try it without the USB and see how it behaves. Asmirc , do you have noise also in the situation that i described ?
PS. I will be back with more after i make some tests with other headphones, other cables and so on.
Thanks!