iPad3 touch screen sometimes unresponsive
I'm typing. Stop to proofread. Cursor still at place I stopped. I type, but nothing appears on the screen.
I touch screen to type in what I'd like to see at a website. Page enlarges. I try to tap the search rectangle to type. Nothing happens. I wait. I tap rectangle. Page again enlarges.
What is going on? How do I fix this?
iPad (4th gen) Wi-Fi + Cellular (MM), iOS 6.1.3