Insignia LED LCD 42 Picture Fades

We just bought a 42" Insignia LED-LCD tv and we've noticed that the picture darkens itself and brightens again constantly as we are watching tv. We thought it may be a setting we may have turned on or something, but we cant seem to get it to stop. We've turned the Energy Saver option off and its now to custom. Any suggestions? It's really bugging us that we can't figure this out. We had an LCD (not LED) tv before this one and didnt have this problem.
Any help you can provide would be awesome! thanks!

Actually, there IS a setting to automatically adjust the brightness and contrast in the Advanced Video section of the settings.
From page 17 of the manual:
"Advanced Contrast-When you see the pop-up menu, set Adaptive Contrast to On to adjust picture detail and brightness automatically or to set Dynamic Contrast Ratio to On to automatically adjust the contrast between the light and dark areas of the picture."
Check and see if Adaptive Contrast or Dynamic Contrast Ratio are turned on in the Advanced Video-> Advanced Contrast section of the menu. If they're on, turn them off, and see if the problem goes away.
*disclaimer* I am not now, nor have I ever been, an employee of Best Buy, Geek Squad, nor of any of their affiliate, parent, or subsidiary companies.

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