Thank you for your response. This does not seem to work for me. I tried bumping this to 50000 via .htaccess (and verified with phpinfo function) but no joy. Interestingly, even before changing max_vars, some fields in this repeater group will save values but others do not.
I don’t know if it is related, but I am also unable to edit this repeater group in ACF…nothing happens when I click on edit link.