I noticed recently that I iPhone 6 Plus hasn't updated any apps since December 21st of last year. There are no apps waiting to update, just two apps that updated on that date. I am running the current software 9.2 and have tried turning the device off and signing out and into the app store. Any thoughts on what might be causing this - I'm sure that there have been app updates to some of the ones I have installed. I know Facebook and Messaging update weekly at least.