Audio lagging when published HTML5 in LMS.

I recently published few eLearning courses in our LMS (SCORM). When doing a pre-launch test, I uncounted an audio problem.

On some slides the audio may start late then expected and will be cut off at the end when flip over to next slide. Note, when I published the course on my own computer, the audio works well.

Please help me solving this issue to finalize my course, thanks.