Hi Yousef,
You seem to have missed including the URL of your site. Kindly provide it as well so that we could check it.
For the meantime, please check for the following first:
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Ensure everything is up to date according to our version compatibility list at https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195. Please follow the best practices when updating your theme and plugins. See https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62 for more details.
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Clear all caches including browser cache then deactivate your caching plugins and other optimization plugins.
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If you’re using a CDN, please clear the CDN’s cache and disable optimization services.
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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 templates.
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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' );
Thank you.