Touch screen works and then doesn't work with 5 or 10 minutes. Did a factory reset and did not work and couldn't get it to work. Waited a few hours and tried again worked long enough to get through the setup wizard and stopped working again. Tried today but battery was dead so started it on the charger and it started working again. It connected to wifi and there was an operating system update so I let it update to KitKat 4.4.2 and now it hasn't stopped working. Is it possible that the previous version was causing some problem with the touch screen? Previous version was 4.3