Hi @blissout,
Sorry to hear of the problem you are having.
Please make sure you are using latest version of PHP on your server by referring the information provided in the following pages.
https://www.wikihow.com/Check-PHP-Version
http://php.net/supported-versions.php
This can be due to plugin conflict on your site so please try temporary deactivating all plugins except Unyson plugin and WpBakery page builder plugins and see whether everything works fine and then enable the plugins one by one to see which plugin is conflicting if any or use following plugin to check it.
https://wordpress.org/plugins/health-check/
Also to confirm whether it is theme issue, temporary use the Twenty Seventeen theme on your site. If everything works fine then it’s your site theme issue.
Best regards,
Shufflehound team