Hi, I never write on this blog as I consider myself naive compared to the rest of you but I had the same problem and just fixed it.
I was using the css menus with responsive (hamburger icon) set at 768 and maybe because of an update the hamburger menu stopped working .
All I did was add the action ‘responsive css menu’ to the same nav box so it had both actions on it, published it without bothering to upload, then deleted the responsive css menu from it so it was the same as before and uploaded and I guess it got rid of some gremlins?
I’d also changed the names of the containers but this hadn’t helped - maybe worth trying though if this doesn’t work? Either way I hope this helps, just thought i’d share as it worked for me - good luck all 
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