Sound Issues Upon Publishing

Hello, 

I have run into an issue with voiceovers not playing after a course has been published to our LMS. It works fine in the file and in review, but upon publishing it, we have gotten feedback that some slides have no sound. Weirder still is that it is inconsistent on which slides play with sound and which don't. Some users have no problems, while others have issues with multiple slides. (And because there is no sound playing, it also doesn't show CC on the slide.)

I have tried:

• Having the sound linked to a trigger (play when slide begins)
• Delaying the sound by two seconds on each slide to give it a chance to load correctly
• Updating and republishing the course

I am unclear as to whether this is an issue with Storyline, people's internet connections, or if it is our LMS causing problems, but any suggestions are appreciated!