DJM-S9 painful digital cliping noise

Hi

I have problem with my DJM-S9 and serato and as my research shows I am not the only one. i work on i7-2.8 GHz 16 Gigs ram ssd and issue looks like this:

  https://www.youtube.com/watch?v=jh2dfk6cwzs

  https://www.youtube.com/watch?v=1zpP8L3Gry8

it happens only when i try to mix digital, no issues when real vinyl is used.

I will be very grateful for Your help.