IPhone 6s Plus screen color fades badly when watching movies?

I've had this phone since August of last year and it's been running fine. It's darn near perfect with a few flaws but no damage affecting the internal parts or water damage. When I watch Netflix, Hulu, my cable app, or YouTube my screen goes from colorful to this dull and colorless screen while watching movies. Is this normal? When I close the app my screen slowly returns to a colorful normal state. It's mostly noticeable when watching Friends.

This sometimes happens to me, I honestly don't know why. If you have time maybe contact apple support.

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