Hi there,
Thanks for writing around! I checked your site and I see you’re using an old version of X and Cornerstone, please update both to the latest versions to avoid such conflict and potential errors. You can find the latest version numbers here: (http://theme.co/changelog/) Then you can compare them to what’s installed on your site.
If you find anything to be out of date, you can review our update guide.
Also make sure to clear all caches including browser cache then deactivate your caching plugins and other optimization plugins. If you’re using a CDN, please clear the CDN’s cache and disable optimization services.
If this doesn’t help then try the following too:
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Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
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Remove custom CSS, JavaScript and deactivate your child theme and switch to parent theme (take a complete backup first).
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Contact your host to increase your allocated memory or do it yourself by adding this code in your wp-config.php
define( 'WP_MEMORY_LIMIT', '256M' );
define( 'WP_MAX_MEMORY_LIMIT', '512M' );
Hope this helps!.