Why does my iPhone arbitrarily brighten, to the point of decreased resolution, despite my having turned off auto-brightness and setting the brightness to maximum?

Why does my iPhone arbitrarily brighten, to the point of decreased resolution, despite my having turned off auto-brightness and setting the brightness to maximum?

Could be a hardware failure.
Restore the iPhone, first from a backup, then as new, and see if the issue persists. If it persists when you restore as new, then there's a hardware issue with your phone and you need to bring it to an Apple store to be evaluated.
~Lyssa

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