Videos don´t stop playing

Hi there,

i´ve got a story about 130 slides and and ~30 contain a video of that.

For example Slide a is a normal slide and slide b is a slide contains a video.

I start with slide b, the video starts.

On the half of the video i jump to slide a. Then i return back to slide b and the video is still running on the half of the video. 

From time to time all the videos in my story are starting from the middle of the video, when i jump to the slide.

How can i change this setting ? 

Thanks for your help!

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