When I shoot in low light situations at high ISO, the noise is minimal and it's great, but the problem I have consistantly are these colored lines that run horizontally across the video. I've attached a screen grab that shows this phenomena. In this case there are purple lines that run across the image.
Is there a reason why it's doing this, any way I can reduce the streaks?

Thank you,
Is there a reason why it's doing this, any way I can reduce the streaks?

Thank you,