No, that was not it @Kal_Lam … it seems I gave you the file AFTER already implementing my workaround. I originally had a choice-list of 10,000 beneficiaries in an external csv file (you can see the file I gave you has reverted to an internal choice list and not an external CSV file). The work around was to reduce the number of choices to approx 1,700 from the original 10,000.
My fault for sending you the file after implementing the workaround, but you can replicate the problem by changing the 2 references to select_one name in the survey tab to select_one_from_file spm_farmers_external.csv and use the external file which still has the original 10,000 farmers. Alternatively, this link has the original file Having problem with Get Blank Form
