Why?
Because you have the Over Exposure Warning setting in the app enabled.
Those areas with zebra stripes will be over exposed with the exposure settings you are using.
I had the same issue, nobody ever gave me a solid reason for it, so I gave up and had it swapped by Amazon due to faulty image sensor. This was no over exposure warning, it was literally anything white, had distortion and lines through it no matter how bright or dim.
Do you mean flickering zebra lines that are caused by the shadow of your props in the sun? As mentioned, you can lose this from view by lowering the camera angle slightly.
Or do you mean zebra stripes in the bright areas of your app? Like this:
DJI-Amy Posted at 2016-3-14 14:35
Hi, would you please provide a screenshot of your app? Did you turn on the Over Exposure Warning set ...
Yes over exposure warning is on. Here is a link with similar stripes http://www6.pcmag.com/media/images/405967-dji-phantom-3-intelligent-flight-modes.jpg
If you have over-exposure warning on, you can't always get rid of the stripes on bright surfaces, like white vinyl siding in direct sunlight. If you're in Auto mode best you can do is use the right wheel on top of the controller to adjust exposure the best you can.