Issue with SCORM randomly stopping communicating with LMS (Moodle)

Thank you so much! Your screen shots are very helpful.  I have similar object triggers at the end of my storyline courses, but I do not have a specific exit slide with the "Complete course as Complete/Passed" 

How did you determine it was 30 second delay? Did you do some testing to see if adding that extra step was the key? Is is possible that the extra time/steps involved with the extra exit slide helps ensure the retry results autosave? 

Here is my result layer:

You didn't show your failure layer, but here is mine.  Maybe there needs to be an autosave delay in the retries?   Or am I overthinking this?

And here is my Success layer:  You can see that in this layer the results must be 100% before they can exit.  If not, they can't even reach this layer.  I will try your method with the save score and continue (to an exit slide) like you suggested and see if that does the trick. 

I'll report back here to later if this method works. So far, I've only encountered issues with about 4 people who cannot retry a quiz multiple times in the same attempt--but to me that is 4 too many. So annoying!  I hope to hear from you, too, how your method is working! 

Agree...steep learning curve! I'm currently my own team--I do both the course design and the LMS admin. Our IT people have no idea what I'm talking about. So thanks for being on my extended team!  If you ever need someone to reach out to...feel free!