Storyline course randomly getting "stuck"

Hello,

I have been facing the same issue where the learners are getting stuck on random pages and the course wont move. I also faced the same issue while taking the course on Chrome. I tried to delete the cookies and temp files and then the course would work but also the same solution did not work for some people and they were still stuck even after deleting cookies. Now since Dec 2020 Flash is no longer supported by Chrome and I published the course in HTML5 format. Has there been any solution to this problem? If there is any recommendation, that would be very helpful. Thank you!