i have an iphone 5 with the same problem, i have replaced the screen twice and is the same thing, i have to lock and unluck to make the screen respond, sometimes it scroll for itself, eventually i cant even slide the buttom to get the calls, this is annoying, have you guys find any solution? help me please, at first i tought it was the ios 8 but im on ios 10 and i still have the same problems.
my email: angelicagonzalez.2403@gmail.com