Download Notepad++, it's free and a good text editor with some nice tools like "Search in all files of a folder".
Start it, use the menu "Search" -> "Find in files".
Select the AddOns directory and search in all files for "CENTER_SCREEN_ANNOUNCE" (without the " ").
These addons use the center screen announce then and you can disable them one after another to find out which one is firing it.
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