I would take it to the Apple store
This is a problem with the screen. It will happen. But like the other people said. Take it to the genius bar
It is a problem with your OLED which is your screen. They had this problem with the X last year but it was never a lot of people.
Contact Genius Bar for help.
Ask Apple customers service. They always busy. Appointment is good option.
Yeah the Apple store will be able to fix it for you. You can walk in and hope they arent busy, or make an appointment ahead of time (probably the smartest move).
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