I took my IPad 3 back to the Apple store in August as the home button was unresponsive in a certain number of apps, including Safari. They exchanged it right away as they suspected it was a hardware problem. Now it is Jan 2013 and the same thing is happening. Is anyone else having this problem? I will hold off taking it back until IOS 6.1 comes out but I am wondering whether this is a wider issue.