Nested animation (walking cycle) flickering on scene

Hello!

I am new to animate CC and need som help.

I made an nested animation consisting of a walk cycle of a man. Each part of the mans armatures is a movie clip symbol, the man itself is also a movie clip symbol.

The animation works great on its own but when nested in to a scene, the animation starts flickering and white stripes appears on the body. The flickering appears in different places in different frames. I can't see a connection since the flickering dosen´t repeat evenly over the frames. I´ve been trying to solve this problem for a while now but I can´t find any solution using google or Animate classroom in a book so now I'm turning to you guys. 

Does anyone no what might cause the problem, and how to solve it?

Kind regards,

Lisa