According to reports, the iPhone 6 and 6 Plus are suffering from a terminal disease nicknamed the touch disease. The disease starts with a flickering bar that appears at the top of the devices’ screens, this bar doesn’t respond to a users’ touch. Over time, the bar grows until the whole screen is rendered unusable. The problem has been around since the launch of the phone but didn’t manifest until recently because the phones are getting older.
The cause of the disease is still unknown, However, iFixit claims that the fault lies with the iPhone 6 and 6 Plus’ logic board, the part of the phone that facilitates communication between the different elements of the device. So far, millions of iPhones could potentially be vulnerable and to worsen the situation, Apple has refused to acknowledge it as an issue.
Not sure if the “touch disease” has gotten to Africa, yet. But if it does, do let me know using the comment box.
In case you find that your iPhone screen has a flickering bar, you might need to either replace the phone, replace the logic board or replace the Touch ICs on the logic board. But I’d go with the Phone replacement.