Output File shows ungraded/graded one frame apart

Please see attached.
The output files after final grade have a pattern like this:
Frame 1: Ungraded.
Frame 2: Graded.

Other files have a pattern like this:

F1: Ungraded.
F2/3: Graded.
F4-6: Versions of an earlier, unfinished grade.

This stroboscopic affect appears on the following cameras:
FS7, A7S, GP7.
It does not appear on this camera:
DJI Mavic Pro

FPS for Timeline: 23.98

Thanks.

Images attached.

It sounds like this is all H.264 material. My opinon: H.264 and other highly-compressed codecs are intended as DELIVERY formats, not necessarily to be used for editing and final color. Using H.264 puts a lot of stress on the computer, since it has to de-compress the images and play them back at speed, in addition to applying all the processes Resolve requires. My advice is to transcode all the H.264 material to a simpler codec for your system, something visually-lossless like DNxHR or ProRes 422HQ, and use that instead. You'll get much better performance that way.

The alternative is to use Optimized Media or Proxies, which basically transcodes it all in the background. My preference is to do it manually, because then I can control where the files go and how they're named.

Thanks as always Marc.

I asked the client to output a single 4444 clip from Premiere based on your counsel from 2018. I didn't forget that lesson.

I cut it up in DR16, graded it, output it as you've seen above. Chaos.

I make no excuses here- after not hearing back from the client for quite a while I deleted all of the derivatives of the master 4444 clips, so I need to recut it. No issue there of course. I kept the original master file.
The problem is that it appears even though all of the node infrastructure is present for each clip, I can't copy a grade from a clip (the ones I deleted) over to a new clip (the same clip, recut and still ungraded).

Should I plan to regrade from scratch?

The problem is that it appears even though all of the node infrastructure is present for each clip, I can't copy a grade from a clip (the ones I deleted) over to a new clip (the same clip, recut and still ungraded). Should I plan to regrade from scratch?

Our workaround for a situation like this is to always Grab All Stills whenever a timeline is finished. That way, if the media goes away or somebody accidentally deletes the Color nodes, we can just copy whatever's in the still and get it back again.

Another thing we do is keep daily backups of each session. The idea there is, in an absolutely emergency, we could ColorTrace in manual mode to just restore the color for that one single clip (or a group of clips).

I had a client drive failure on a client's system some years ago, and what saved us there is I had a backup of the session on a different computer, and I just exported the DPX stills (with companion DRX color files), and was able to manually rebuild the corrupted timeline. That was kind of a "brute force" situation, but it was a nail-biter because the client was aware that if we lost the session, we'd have to redo about 50 hours of work. I think it took less than 4 hours to rebuild the entire 2-hour feature from scratch, but there was a lot of cursing and mouse-clicking to do it. I always say: "show looked great, client was happy, check cleared." All was well in the end.