Most of us have made changes in the core file of WordPress theme. This modification lapses after updating the theme. Even though, you are aware of this fact
Guide on completely removing W3 Total Cache plugin residue in Wordpress site. Even after uninstalling, deactivating and deleting this plugin.
[Solved] an automated WordPress update has failed to complete – please attempt the update again now.
This happens when any of the WordPress component (Theme, Plugin, Core files) returns with failed update process notification or showing maintenance notification.
Due to technical error or load of a server may hampers the update process of WordPress. Thus, the website steadily displays a maintenance page, which is annoying.