Why? Because you get lag while playing a game when auto brightness kicks in? So turn the setting off while you play your games.
That's a stupid work-around for something that shouldn't even be happening.
This issue didn't start until 9.3.2 and I was hoping that 9.3.3 would fix it. Apparently, I'm the only one around here that is even affected by it.
Everyone else thinks 9.3.3 is the greatest OS on the planet right now.
They ruined game performance in 9.3, then they ruined auto-brightness in 9.3.2... Can't wait to see what they ruin in iOS 10. I can't even trust any updates anymore.
Funny thing is... I never actually experience any bug FIXES, but I do actually experience brand new bugs that didn't exist before.