FS7: Black Horizontal Lines Artefacts?

Just noticed a strange thing watching the dailies - the footage exhibits black horizontal lines next to highlights, here the white fingers. Below is an ungraded still in Slog. We're recording via the RAW out to a Shogun in 2k Prores HQ. Any ideas of how to avoid this? I'd appreciate any input!
Line Artefacts.jpg
 
How can anyone have a clue if there's almost nothing about your camera settings and zero information about your post workflow? The screen grab is also way too small to see anything. Is it a crop, how magnified is it? All this matters.
 
To be honest, I can't spot any black horizontal lines, even zoomed all he way in. *shrug*

I haven't heard of this issue before, either. Maybe a link to something short on Vimeo would help us determine what's going on.
 
We're recording via the RAW out to a Shogun in 2k Prores HQ.

Have you compared internal recorded XAVC to the RAW>ProRes? Not saying this issue is caused by the FS7's RAW output as I've never heard of this specific flaw before, but there's other well documented problems with 12-bit Linear RAW.

If interested search this sub-forum for the term "Linear".
 
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