That's not it. It randomly goes dim while you're doing something. To get the normal brightness back you gotta lock & then unlock.I do know that right before the phone goes to sleep the screen goes dim for a second or two. If you tap the screen the brightness comes back. If you do nothing screen locks.
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Mine does the exact same thing occasionally. iPhone 5That's not it. It randomly goes dim while you're doing something. To get the normal brightness back you gotta lock & then unlock.