Are your plugins up to date? In this case, my concern isn't if you've clicked the "update now" link, turned on automatic updates, or if you've deleted those you aren't using (you should do all of these things). What I would like you to check is when was the last update.
How to check
In your WordPress dashboard, click on Plugins and then "View Details". The right side of the screen that pops up is what I'm most interested about. In addition to the current version number, this area shows when the plugin was last updated, what version of WordPress it requires, compatibility, and minimum version of PHP.