Spam clicking issue

Good afternoon All

Feedback has come back to me that a lot of our colleagues are "spam-clicking" the mouse while they wait for slides to transition from one to another. In a perfect world they wouldn't do that but they do and it's causing course issues. 

I built a rectangle (at 99% transparency) to cover all elements of my slide and for the rectangle to disappear when I want the colleagues to be able to interact with the slide. This has usually worked to not allow colleagues to interact with the slide until I want them too. 

So I added a rectangle to cover my slide and in testing this I noticed if, in preview mode, I spam click while my slide is loading, it takes about 5 seconds then jumps automatically to the next slide. This is of course not good.

Things I have checked for so far: 

-Slide properties are advance by User.

-There are no rogue triggers on any of the elements or timeline. 

-No cuepoints on the timeline. 

Can anyone think why a slide (that should be "protected" by a transparent rectangle) is jumping to the next slide if I spam-click the slide as it's elements are loading up. (Within the first 1-2 seconds of the timeline.)? 

Any help would be greatly appreciated.