Why does my Iphone 4 consistently keeps flashing?

My iphone 4 still works totally fine. Like I can still check my messages and make calls; but the problem is the lighting will NOT stop flashing to dim and really bright extremely fast. I did not drop my phone what so ever. This happened when I was trying to add a contact to my phone and was saving a photo for the contact's ID picture.

There's no reliable home made solution to this problem.

Because it is a pervert.

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