Touchscreens have become the standard, but the truth is they can have some important errors. It sometimes happens that we press the screen but does not seem to be responding, or does not respond in the right way. Sometimes the solution to this problem is very simple. The only thing needed is to turn off the screen, cleaning, and then turn it back on. If the problem persists, then it is probably not a matter of the screen, but the smartphone, so it is best to restart the smartphone.