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Hello there,
Welcome to our support forum, and thanks for your contact!
First, by looking at your debug info, it is possible to see that the WP Memory Limit is set to 40M, while the recommended is 256. Changing it can avoid these problems. Please follow these steps:
- Find your wp-config.php file in the root directory of your WordPress installation
- Open the wp-config.php file with a text editor, then locate the line that includes: define('WP_DEBUG', false)
- Then add after it, the below line of code: define ('WP_MEMORY_LIMIT', '256M');
- Save the wp-config.php file, then refresh your website
Now, regarding the 'MySQL server has gone away' message itself, usually it means that your hosting cut the connection to the database. This can happen for internal issues, maintenance, etc.
If you see that notification, it has a close link ("x" button) that you can press and if it doesn't appear again, then it means the problem is gone.