Just because you have write access from the ftp user doesn’t mean that the user Apache/PHP is running in has write access. I’d advise you upgrade manually, or check your write permissions and ownership for whichever user Apache is running as on those files.
Changing random post publish time for repost
This is not a feature of any known process. The automatic updater (currently) does not do this. The updater does this neither explicitly in an attempt to update security, nor does it leave a mess like this behind if an update fails. This is pure user-error1, or at least a user-land change. 1: or, in … Read more
It turns out that the problem was caused by the Plesk server admin system which had been used to install WordPress, Plesk tried to upgrade wordpress on that domain and it failed and partially deleted the contents of those folders. Plesk enables auto update for all applications installed using its “application vault” feature. So if … Read more
Translation update successful but apparently not
How to create a WP Cron hooks based on schedules from Advanced cron manager plugin?
Try auto_core_update_email. E.g: add_filter(‘auto_core_update_email’, function($email, $type, $core_update, $result) { if (‘success’ === $type) $email[‘body’] = sprintf( __(‘Congratulation! Your site at %1$s has been updated automatically to WordPress %2$s.’, ‘textdomain’), home_url(), $core_update->current ) . “\n\n”; return $email; }, PHP_INT_MAX, 4);
Auto updating a single plugin
It turned out that a malware scan was running on my host that was stripping the code from my file.
Have you looked at https://codex.wordpress.org/Configuring_Automatic_Background_Updates for help? Several options in there to enable/disable updates according to your needs?