Faulty CCTV picture

[quintain]

A cctv camera appears faulty, it shows a band at the bottom of the picture.

I attach a picture showing the camera and fault. it's location is obvious however 2nd down and 2nd in (i.e. middle)

The faulty picture shows on all good connections, accordingly it is the camera not the wiring to that camera.

BTW the camera was given to me a couple of days ago, I was also given a second same  specification camera and that works excellently.

I have tried all camera types available to my DVR i.e. TVI, CVI AHD and auto for this faulty camera; the good one works on auto & AHD

Is this bottom band problem a known fault or is it simply a faulty piece of electronics that should be thrown away.