please clear the problem when you get this problem while charging or without charging. if without charging the problem in your device hardware capacitive touch screen or might be a software not a rom its hidden part which we never ever touch the whole hidden part pre programed IC (integrated circuit) might be little corrupted or buggy, i never suggest to give to a service center they might change mother board to another problem board,so you must show to experienced mobile repairer technician in your town..
NOTE edited: suggestion means is not that not to give to service center at all there also experienced technician. suggesting you to show them where really experts are working.