Silence added to end of each slide on publish

I use Storyline 3, and we recently upgraded to Windows 10.  Now when I publish there's a noticeable lag from the animation that I synced in Storyline to what happens in the published course, most noticeable at the end of slides where there can be up to 5 seconds (or more) of silence before moving on to the next slide.  What's going on? 

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