I think my nexus 7 purchased at Christmas has a problem (or so it seems to me) thing is that I discovered that when I put it on a flat surface touchscreen does not respond well, but take care when in the hand example, runs correctly. I realized one day to use the application "multitouch test". When the tablet is in a table for example, and begin to move your fingers across the screen there are areas in which I can not find the finger after a while (as if to put the tablet on the table that will create some blind spots in the touch) screen, but when used in the hand or holding it horizontally or vertically on the table works well. Anyone else would have happened? Or know it could be happening with the touch screen?