Navigation menu freezes screen

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I created a branched navigation menu that allows users to advance to one of three areas with the help I found in this post (Can you use variables with an audio track?). I have three audio files that play based on a variable (initially set to 1) that is incremented each time a selection is made.

 

Section status == 1 (Click one of the options. Click NEXT when you have visited all three.

Section status= = 2 (Select another option.)

Section status == 3 (Now that you have viewed all three options, click next to continue.)

 

 I have attached the navigation slide.

 

My users, many of whom have older and slower machines) are reporting that the screen is freezing at this navigation point (I am not seeing this behavior). Can anyone help me understand why this is happening and what I can do about it?