I recently started having this problem with my Xperia Z3 Compact. From time to time the touchscreen registers a click/touch in the top left corner for no reason. It happens randomly several times a day and as far as i can tell it doesn't matter whether I'm already touching the screen or not. Also when it does happen it usually clicks several times for some seconds.
Restarting didn't change anything. I do have a screen protector but this problem only started recently (as in the last few weeks) and I have had this phone (with screen protector) for almost a year now. Is this Hardware or Software related? Please help.