Something like this is impossible to diagnose without knowing the details of your comp and the properties of your layers. Your video link is broken. The only non user error issue I can think of is compression artifacts.
Thanks for your reply Rick,
this is the link, hope it will work this time:test - YouTube
I will try to be more specific about the comp:
All the letters layers are 3D, two lights(see attache) using AE cc 8 bpc
Your comp is a mess. You have 2D layers above your letters, but below the lights. That's gonna wreak havoc with 3D rendering. Restructure your work.
Well, I tryed to move the layers and make some order but still nothing.
Any idea ?
This kind of looks like a z depth problem with layers in the same place interacting with each other. The layout of your stage is also a mess. Put all the 2D layers at the bottom of the comp and make sure that you do not have any 3D layers intersecting with the layers that rotate.