I cannot find the key words (
autoReloadChanged) you mention in the current documentation of Sublime Text 3, so probably they are from version 2 or even older.
The relevant part from the default settings is IMHO:
// Always prompt before reloading a file, even if the file hasn't been
// modified. The default behavior is to automatically reload a file if it
// hasn't been edited. If a file has unsaved changes, a prompt will always
// be shown.
As you can see this is disabled by default, but perhaps somewhere in you config (packages(?)) it gets activated. So try to set
false. Then Sublime Text silently reload a file if it detects any changes to it.
And please note the comment about unsaved files. I use the following setting, as I think it's quite handy, especially if you use focus follow mouse in your OS, but this might depend on you personal preferences:
// Set to true to automatically save files when switching to a different file
// or application