Screen in camera mode show black wave running

[Methee]

Hi I have bought Xperia z3 for 2 months. I have just noticed something that might be a problem with my camera.
I am not sure whether anyone has experienced the same thing.

In camera mode (both video and camera) sometime the screen shows soft black wave running from top to bottom (for more understanding about "black wave" just like when you focus the camera on TV screen). However I didn't focus my camera on TV screen anymore. The problem last for 1-5 minutes. When this problem occurred If I go on and take a photo sometime the wave could be captured into my photo as well but mostly these running black wave can not be captured into the photo.

(I have attached a photo taken when the running black wave problem occurred and this time it was captured in my photo.

Anyone experienced the same issue? Is this the problem with software or my camera hardware problem? So stress

Methee

remark

- my camera len is not dirty anymore, it is perfect clean

- my English is not good so apologize 

[Lord_viridis]

You wanna see even more fun, take a burst shot under Flourescent light, 1 in every 3-4 images will be yellow, one will be too blue and one should be just right lol