I'm not sure if it's important or not, but even if touch screen stops working you can close the lid, wait for the laptop to sleep and then click power button to wake it up. Then when you open the lid the touch screen works.
I'm not sure if it's important or not, but even if touch screen stops working you can close the lid, wait for the laptop to sleep and then click power button to wake it up. Then when you open the lid the touch screen works.