My wordpress menu get erased randomly. And I cannot replicate this issue.
I duplicated my whole site to a testing site, and dump the DB.
One day, I found my menu is gone, and I check the database,
mysql> select post_title, post_name, post_type from wp_posts where post_type='nav_menu_item' ;
It return 0 menu.
I disabled the plugin Stealth Publish and fixed the issue.
It took me 3 weeks find the solution.
