Forum Thread: Excel "Recent/Pinned" Box Resets Itself

Excel is pinned to my taskbar; I have two workbooks that I've been using a lot lately, so naturally I pinned them to the right-click menu. The problem is, at least once a day that menu resets itself, so both of the pinned workbooks are unpinned and there are no files under the "Recent" heading. How can I stop this from happening again?