Many people installs various cleaners in hope that they can make their devices faster. Wrong. In addition, these applications remove “unused” files. But how these applications know which files are trash and which should be preserved? Answer is simple : they don’t know. They skip media files or folders made by well known applications, however many files (like magic dosbox settings) are in danger. Of course, these applications offer setup in which is possible add exception on cleaning specific files and folders, but almost nobody uses this setup. Result is : deleted files, folders of various applications and blaming on affected applications, that they have bug.
Another problems come from Samsung. This company sends silent updates during night – and users are not notified about it. Update is downloaded by system, applied + internal storage is cleaned from “trash”.