read data timeout in 40 seconds

Hello,

Looks like your execution timeout is configured to 40 seconds, then your wp-cron event had no time to be executed completely — the process was killed by server.

I can suggest you to replace wp-cron with a real cron job.

Steps:

1) Add to wp-config.php:

define('DISABLE_WP_CRON', 'true');

2) If you want your cron job being executed daily:

# vi /etc/cron.d/wpcron

0 1 * * * www-data wget -O /dev/null -o /dev/null https://www.domain.com/wp-cron.php

3) Done ??

Regards

So can you explane little more about this fix?

This fix will disable wp-cron in your WordPress install and enable a cron job in your server. Once cron have no timeout to run, your problem will be solved.

Also you may want to review your WordPress scheduled events, since they are taking more than 40 seconds to execute completely.

How can i check this? And can i check what type of scheduled events that make this error?

You can use the plugin Debug Bar Cron to get informations about your WordPress scheduled events.

https://www.ads-software.com/plugins/debug-bar-cron/