I can see vertical lines when I am trying to take pictures in Sony Xperia Z2. There are in center and when I take the photos there are not lines in it. I am not quiet sure from where this lines are appearing. It looks bad on the screen. This appear usually in the dark. When there is low light. And then the lines are gone. I hope this is not some kind of hardware issue in my device. I take too many pictures and use the flash a lot. So my battery ends up fast. For that I am using a portable charger with me. I charge the phone around two times in a day. Does that cause any issue with the device. How to find the screen is not faulty.
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