Disappearing Footnotes

For a while now footnotes have been disappearing from my documents--just the actual footnote, not the reference. When enough disappear that text reflows I receive the "Overset Text" error, but recently one disappeared and text should have reflown but did not, and I received no error warning. This was only caught by chance before sending it to the printer. 

I have seen others on forums struggling with issues like this, but there are never any answers, from Adobe or from other clever typesetters. This is a very concerning problem. Please let me know if there's any way to at least make sure I am notified if footnotes disappear!