Storyline 360 course freezing in random places.

Hi,

I published a course which freezes in random screens. I searched few forums and just found that this problem occurs for the past few years. But I didnt come up with any forums which clearly stated the reason or providing any solutions so far.

We face issues mainly when launching the course in IE. But we have no other choice, because we cannot insist on every course attender to not to use IE.

Can someone please enlist what are the factors that could cause this issue, and provide a solution if available.

Description about the course: The course contains around 15 low quality animated videos in mp4 format (but don't tell me this is the issue, because it wont sell). It has 5 or 6 interactive activities, then 25 quiz (questions and answers).

We are deciding to remove the videos and placing them as gif images, in case it resolves the issue. But for us, spending so much time in changing all the videos into gif images and reworking will be so expensive. At the same time we are not sure whether this could solve the freezing issue.

Can someone please help.

Regards,

Siva