Timeless Male Hair from DAZ is rendering with odd gray stripes in Firefly. It looks much better in Superfly. But this product is so old it predates Superfly, so I don't think the problem is that the shaders were meant for Superfly.

Superfly on the left, Firefly on the right.

And here's the shaders.

Change the texture filtering on the texture Image Map nodes, and/or lower your min shading rate in render settings.

If you don't know what those mean, google my name along with either phrase and you will.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)

Thanks, that fixed it! I usually render with the shading rate set fairly low (I've been around long enough to remember when you'd get weird seams on skin textures if the shading rate was too high). This was a test render using the automatic minimum render settings.