Light sensor or timer dims screen up and down during video playback

[Vance]

I am not sure which is the culprit, but while playing back video or even at random times, the screen shifts lighter or darker seemingly at random, and one time during a video playback on the TV.com app, it went black altogether. I am not sure whether it is the timer or the ambient light sensor, but I am tempted to turn the sensor off and push the timer back a lot.

Any thoughts?

 

[OctoMom]

I've seen this same problem on my phone but not that often and never while playing video, personally.

I have no idea what it is or how to fix it, it seems random like you said. The backlight gets dimmer and brighter every once in a while.