My iPhone 4S keeps shutting down, My iPhone 4S keeps shutting down

This is most often due to faulty battery. First step however would be Restore with iTunes on computer to rule out software problem. If still problem, make Genius reservation and take to Apple Store for quick minutes free battery diagnostic tests. If a problem is determined, and there is Warranty or AppleCare it will be covered.

Mine is doing the same thing plus randomly deletes contacts and music on its on ... This is starting to get very old and most days it makes me wish I had kept my android