Leave the battery out of your phone for a couple of minutes.This will discharge any electrical capacitance built up in the components.Once removed, hold your power key for a full 60 seconds.Power off your device and remove your battery.a sudden or unexpected build up of static electricity can be the culprit. Try changing the charger and cable if necessary. Make sure you are using original charger and cable. Sometimes this happens while a device is being charged with a micro USB charging cable connected.
The cause of this can be any number of reasons. Read More About Touch Screens This phenomenon is known as phantom touches, or ghost touches. This occurs also when a number or letter appears without the phone having been touched at all, or when more than one alphanumerical value is entered from just a single touch.
