Just an update regarding ghost touching issue on my iphone 5. I tried updating to the latest 10.3.2 software and it helped. Ghost touching is gone but sometimes screen is unresponsive after clicking once (example: either by typing a letter, punching a number in the calculator, scrolling on instagram). I have to lock and unlock the phone and everything goes to normal again. If i do not perform the lock unlock then the touch screen will not respond anymore even when tapping repeatedly.
I did the software update after restoring to factory default. Now i'm afraid if i restore my backup from itunes the ghost touching might come back.