Cdj 2000 nxs distortion sound from digital out

Hello to everyone , last night ive notice after hours of djing at the club the right cdj was making a noise when my cdj was connected to the mixer by digital out.

I have change it immidiatly to Rca again and the sound was perfect.

After i restart the cdj with digital out up again the sound was excelent. i have the firmware 1.85

any one have any solution or problem with this ?