Hi,
Thanks for this amazing plugin
We are having a similar issue. We upgraded to 3.9 and to the current version of the plugin.
We have a custom post type with 3 nested repeater fields with the flexible content (For creating tables). When we click update the page loads for a few minuted then goes to a 404, or sometimes back to the page with the data gone.
I have tried to break it up to one table per page instead of all of them on one page, but we are running into the same issue.
I have changed our execution time to 600 seconds, and has not fixed the issue.
Thank you,
Drive Digital