Cdj 350 drifiting out

Hello guys !!!

I m experiencing some trouble that I will try to explain.

I have done the beat grid on Rekordbox (see pics bellow),and the beat grid it's correct .When I was playing the tracks ,they loose the beatmatch...like if the tracks wasnt on the same pitch...

I made this two videos bellow ,the first one the tracks are ok and doesn't drift out ,but in the second video ,like you can see ,the tracks drift out...

https://www.youtube.com/watch?v=BjjFB7Kc4bU

https://www.youtube.com/watch?v=0PN-P5vgR6k

Before contact you here ,I have tried:

- On another pair of cdj 350...same thing again

- On another cdjs ,this time at a cdj 2000, same thing...

- Another Dj and I remade the beat grid ,and continues the same thing...

- Actually I have more tracks doing this than playing normally...

- I downloaded again the tracks,this time from another source...same thing

- I tried convert the tracks to mp3  again in 320kbps ...not change...

Are someone having the same trouble?

Pls help me...

Tks

Cheers