DDJ-SZ jog LED flicks

Hello,

I have this weird issue with the DDJ-SZ jog LED.
I tested the controller with 2 PCs and MAC and with different USB cable and still have the same issue.

it is randomly happen while i play, that the jog LED flicks (go off and on , like flash).

please see the movie below :
https://www.youtube.com/watch?v=h6LUnEm2HHw

The video that shows the job LED flicks flash, go to 1:25 min 2.02 MIN and 2:54 min