My repeaters weren’t saving and I think I tracked it down…. I had 3 nested repeaters, in an options-page, and the third and final repeater wasn’t saving.
WAIT FOR IT!!!..
The issue is the mysql field length.
wp_options > option_name
With a naming convention like this — options_sidebar_builder_0_parent_section_1_sub_pages_1_post_page
you need to utilize the maximum of 255.
For me, it wasn’t php memory allocation after all…