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Timezone: America/Bahia (GMT-03:00)
Hello,
Thank you for contacting WPML Support. Before a more detailed look, please, try this basic troubleshooting:
1 - Make sure your server environment meets our minimum requirements as described at: https://wpml.org/home/minimum-requirements/, you can see your current values at your WordPress Dashboard > WPML > Support > Info menu.
2 - Disable all the plugins and try to enable only the WPML related ones from your WordPress Dashboard > Plugins and see if the issue is gone, if so, activate one plugin at a time untill the culprit one is found.
3 - If the issue persists, temporary change to a default WordPress theme such as the 'TwentySeventeen' theme from your WordPress Dashboard > Appearance > Themes menu.
IMPORTANT: Please, note, a backup is required for security reasons and to avoid any data loss, you can use the https://wordpress.org/plugins/backupwordpress/ plugin for these backup needs.
Please, let me know if the steps above help to fix your issue. Have a nice day.
I disabled all the plugins, then reactivated each to confirm what plugin was causing the issue, which was the WPML Multilingual CMS plugin. When looking at the hosting of the website I saw PHP 5.6 was being used, so we upgraded it to 7.2 which seems to have fixed the issue.