Videos randomly disappreaing when working with multi-state objects.

So I have been working with Captivate for about 6 months now and I recently started using mulit-state object and advanced actions. I have created a project with a "next" and "previous" button that when clicked loads the next state of a video. The video object has 13 states that are all different source video files. I did this because I wanted the transition to be as smooth as possible, so I didn't want it to load a whole new object or even a new slide. The problem I am facing right now though is very weird and extremly frustrating. When i cycle through the states, certain videos just randomly disappear. Weirdly I found out that pausing the slide will have an effect on this, but whenever I set the button to pause the slide, other videos now disappear. Could this be a problem with the way I preview the project? (Usually within Captivate using preview options). Or is there something I am missing? Thanks in advance for the help