Track matte flickering with Cinema 4D

Hi
Im new to Cinema 4D.
Im using the AE 3d Camera tracker to place an extruded tekst from Cinema 4d. I've done the following:

Tracked camera in AE, made ground plane, tekst and camera in AE. Exported to C4D. Importet back in AE.

In C4D i've extruded the tekst, set up lights, and a plane to catche the shadow, and appalyed a texture to text.
Added a render tag for the extrusion with it in buffer 1 and made multipass for objectbuffer and shadow.

Back in AE i've made dublicates of the C4D file and used multipass with track matte and luma matte to isolate the text and the shadows. Ive also tryed with just one track matte and multiply mode for the shadow. Same result.

When I render it out it the shadows, tekst and plane flickers in and out (see link https://youtu.be/qpG-N-87W9I)
Am I doing it wrong or is there some other problem?