I was out flying today shooting some clips of friends on motorcycles. I noticed there is some red flashing interference in the clip as I point the gimbal down. You can see it in the video below toward the end of the 2nd clip (0:24 - 0:29 mark)
Are you using a polarized ND filter? What was your video resolution, mode and style? I do think your color saturation is a bit high making this problem worse.
Interesting. It seems like something optical, which might be good news in that it doesn't look like a camera defect. If it were me, I would go out and try to film the save pavement, same time of day, same angles, etc. Then turn the craft around at the same spot. I too wonder if it's a polarization effect (if you're using a polarizer, you might mention the brand and strength).
Chris