DJM-750MK2 noise in headphone outputs

Hi,
I just purchased new mixer DJM-750MK2 and I realized there is a problem with headphone outputs (both of them). I can hear a
noise of high frequency and very low intensity in the headphones even if there is nothing connected to the mixer. The intensity does not change when I change the headphones volume.
I tested it in different places with different headphones.
Then I googled it and found many people (as well in UK and Germany) complaining about this issue.
Here as well https://forums.pioneerdj.com/hc/en-us/community/posts/360017931106-DJM-750mk2-buzz-whine-on-headphone-jack

Is there already any solution how to get rid of this annoying noise?
Thank you!