The term “Touch Disease” refers to the touchscreen issues that surface after the phone undergoes stress, like being dropped on the floor or sitting on it in your back pocket. In many cases, iPhone users have complained the touchscreen will entirely stop working, start glitching or have grey blocks on the top or bottom of the display.
The problem is caused by the two touchscreen controller chips, or Touch IC chips, on the logic board inside the phone, Apple has confirmed this flaw in the iPhone 6 and 6 Plus
We can replace the Touch IC chips on your device for $125 by appointment only. Turn around time is generally about 4 hours.