help: org-mode menu presence mysteriously disappearing and reappearing when I navigate the document

[Cook, Malcolm]

Hiya org-mode-philes,

I have a org document that, when I navigate through it, the org-mode menu 
disappears and reappears.

I am having trouble debugging this or creating a reproducible example and 
welcome any suggestions as to how to do either, or insight into what might be 
going on.

I do use a variety of org-mode extensions and other packages and when I limit 
my init.el to just basic org mode, the problem goes away, so it is obviously 
some interaction.  They include:

org-table-comment
org-special-block-extras 
org-tidy
org-modern
outshine
polymode
and friends...

Thanks for any insights!

~ Malcolm