Forms CSV downloads empty

Hi,

I have two forms one with 250 responses and one with 8700 responses. Both show up correctly in the admin and I can view all the data. I can download as csv for both but the one with 8700 has no data in the csv file that downloads.

Is there a limit or something that is stopping the content output of a large amount of responses? I'm going to advice doing it monthly but need to get this data out first.

Summary:

Perch: 2.8.4, PHP: 5.3.3, MySQL: 5.1.73, with PDO Server OS: Linux, apache2handler Installed apps: content (2.8.4), assets (2.8.4), categories (2.8.4), perch_forms (1.8.3), perch_backup (1.2) App runtimes: <?php include(PERCH_PATH.'/core/apps/content/runtime.php'); include(PERCH_PATH.'/addons/apps/perch_forms/runtime.php'); ?> PERCH_LOGINPATH: /admin PERCH_PATH: /var/www/vhosts/XXXXXXXXX/httpdocs/admin PERCH_CORE: /var/www/vhosts/XXXXXXXXX/httpdocs/admin/core PERCH_RESFILEPATH: /var/www/vhosts/XXXXXXXXX/httpdocs/admin/resources Image manipulation: GD PHP limits: Max upload 128M, Max POST 8M, Memory: 128M, Total max file upload: 8M Resource folder writeable: Yes HTTP_HOST: XXXXXXXXX DOCUMENT_ROOT: /var/www/vhosts/XXXXXXXXX/httpdocs REQUEST_URI: /admin/core/settings/diagnostics/ SCRIPT_NAME: /admin/core/settings/diagnostics/index.php