Update 10/10/16 http://www.macrumors.com/2016/10/09/law-firms-join-lawsuit-apple-iphone-touch-disease/
Okay, so it seems Apple iphone 6 and 6+ customers have had numerous issues with a fault dubbed as "Touch Disease" Nope, it's not a case of washing your hands after using the bathroom, but a rather annoying flickering grey bar appearing at the top of the screen after around 2 years of use. Why does it happen?
Well, it looks like a microchip loses contact with the main-board / Logic Board, rendering the touch functionality absolutely useless. On top of that you get a lovely grey bar that flickers along the top of the screen (Not lovely, I know) Some people are reporting that pressing down at the top of the phone forces the chip to make contact again and the issue goes away for a short time.
Remember the iPhone Bendgate? Well this issue could very well be tied into that very issue. Obviously when you bend something, unless everything connected to it is designed to flex with it... You're going to see weaknesses at solder joints and other potential component issues. (Now what?
Well, it seems Apple aren't currently recognising it as an issue, and therefore are not equipped to deal with it. You'd have to take it to a 3rd party repair shop to get it fixed.
Has anyone on the HUKD forums had this issue? Or any luck getting Apple to carry out a repair? Would be interesting to see how many this has affected. Seriously not good :(Info source - Here