error: movie suddenly restarting by itself

Hi,

I am experiencing a very strange phenoma. I am running a patch with 2 movies (going to 2 different jit.worlds). Sometimes the movies jumps back to the beginning by itself. This occurs randomly and not always.
With "by itself" I mean, that I cannot find anything in my patch, which could possibly trigger that. (Stripped down version attached)

Besides the two movies, there is some DMX-Control going on, nothing else.

Is it possible, that it is the movie or movieobject itself jumping back to 0 by itself???
Can I force it not to that?

The movies are encoded in HAP and I am using the Hap-engine.

Thanks!
rené