Storyline time stops but audio keep playing

Hello, i have this pretty big problem.

When a user is playing a storyline in the course, if this user decide to scroll back up and the storyline screen isn't in the window my entire timeline stops wich is great. But the audio keep playing? so when the user goes back down every animation isn't coordinated with the audio anymore. 

Anyone know how to fix that since it is pretty annoying.

Thank you.