Hey ,

Could you please go through this checklist quickly so we can rule out common issues https://themenectar.ticksy.com/article/5032/ .

The issue can be fixed with any of the following approach, please follow them one by one:

1) At first Increase the AutoSave Interval by adding the line in define( 'AUTOSAVE_INTERVAL', 160 ); // Seconds into wp-config.php file of your WordPress Directory, just above the /* That's all, stop editing! Happy blogging. */ line. Use 240, 300 etc if 160 doesn’t work.

Reference: http://codex.wordpress.org/Editing_wp-config.php#Modify_AutoSave_Interval

2)Increase the PHP Memory limit:

a) Edit your wp-config.php file and enter the following:

define('WP_MEMORY_LIMIT', '96M');

WordPress memory can be different to the server – you need to set this regardless of server memory settings

http://codex.wordpress.org/Editing_wp-config.php#Increasing_memory_allocated_to_PHP

b) If you have access to your PHP.ini file, change the line in PHP.ini If your line shows 32M try 64M:

memory_limit = 64M ; Maximum amount of memory a script may consume (64MB)

c) If you don’t have access to PHP.ini try adding this to an .htaccess file:

php_value memory_limit 64M
d) If none of the above works then talk to your host & ask them to increase it.
Best.