iPhone 5 - Pulls the "Yellow" screen once in a while.

My iPhone 5 every now and then will get that nasty looking yellow tint to it's screen. This only happens once in a blue moon and most of the time when going from indoors to outside in bright sunlight.
99% of the time the screen is perfect.
I have the auto brightness set to on. :eek:

Is my phone defective or is this behavior normal for the iPhone 5?
Thanks.