This is my first day got WH-1000XM4(black) after wearing a few hours with NC on, I turn it off for a lunch, and when I wear it again, and turn on the NC, their is buzzing sound in on my left ear side, I have tried to reset to factory mode, but the problem persist. I do not know if this is a hardware issue or software issue. I have my WH-1000XM3 with me, and reconnect it to the same device, their is no such problem at all. So frustrated since their is a problem is the first day of wearing those new model. I hope sony will have a soft ware update to fix it