You have a lot of reasons why you can disable the automatic update in the WordPress. The most obvious is heavy, it will install a customized WordPress. If you disable the automatic update, it will be able to prevent corruption in the system.
I will pass through the two methods. In this article, at first, it is to disable the update of WordPress core, to enable your theme / plug-ins in order to still update. The second method, disable all updates (core, themes and plug-ins) a.
Disable Core Updates (keeps plugins & theme updates enabled):