Crossword Puzzle Triggers

I need some assistance on issues I am experiencing regarding a crossword puzzle that I made on these slides. Here is how it is supposed to work:

1. The user can click submit any time and if each box does not have exactly what is supposed to be in them then they are asked to try again. Hitting try again hides the try again layer.
2. When they hit submit with all the boxes containing the correct letters it plays a "you got it correct" message and the learner is asked to click "Next" to move on. 
3. The puzzles for these 6 characters are all identical and the correct answers are here in this screenshot. (3, 7, 8, and 9 across all tabs correctly, for the rest of them it is best to click each box one at a time):

This brings me to my issue that I hope I can get some help with. Sometimes, everything works as intended without a hitch. This is how I know my triggers are all set up correctly. In these instances, I can click submit multiple times, get asked to try again, and then submit the correct answers no problem. 

However, whether I am in Storyline or Review360, there are times when after clicking submit once or twice (and I think even sometimes not at all), submit doesn't work. I see that it's clickable, but nothing happens and only refreshing the page helps fix it (but all the progress gets erased). I've ran several successful tests where it works perfectly but then this annoying glitch happens and I don't want the users to have to worry about it at all if I can help it. I have attached the slides in question (with the next slide from the presentation as well so it can test the "next slide" trigger). 

I removed all the other variables that are in the larger file which, I will say, is much larger than the size limit for attachments, I don't know if that has anything to do with it but the file size is 427 MBs for the entire presentation.