My Next button keeps disappearing from the Trigger menu

I'm creating a 25 slide course in Storyline 2 and I'm having a problem linking a trigger to the Next button. On some screens the Next button doesn't appear as an option in the Drop Down menu. I have tried deleting every other trigger on the page and have tried to cut and paste a Next related trigger from a page where a trigger works with the Next button works but no luck. Is this a common problem and what advice do you have?

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