Weird camera bug?

[Lucy Davies]

I've had this twice now withing a couple of weeks. I boot up the camera & everything is black & white & looks like I'm recording the TV get lines appear on screen. The only thing that sorts this out is to turn the phone off then on again. Any idea why my camera is doing this? Running 7.0 Nougat. Think this camera bug started shortly after the October security patch but not 100% sure.