Sometimes smartphone's touchscreen respond too slow or touches might be detected inaccurately. In such cases, smartphone use become terrible and annoying. In such cases, yo can try "Touch screen calibration method".Calibration process helps the device to represent the point and image location on the display accurately. You can simply use an Android calibration app from the play store to fix such problems. Most probably calibration apps works on both rooted and non-rooted smartphone. But, some of app especially requires root access.Be aware when you are going to pick up one.