Bartok turn on headphone peak noise

I’ve been demoing a Bartok for past six month
using Bartok with ethernet is working well
last week I try to connect to PC by usb cable (USB1 mode)
the sound has been amazing
but when I turn on my Bartok from power off , my HD800S will make peak noise like zz~!
I try to disconnect usb cable still the same

Condition is … 1.Headphone connected 2.At USB1 power on bartok

when the delay on headphone will peak noise

Is this normal ??