Blue hue changes frequently within a clip. Is there a fix?

I haven’t seen this before. Same lighting, same camera settings (full manual wb and exposure, though af might have been on) but this time my host’s blue shirt seems to “blink” between a deep blue and more of a purple. Not exactly rhythmic, and not necessarily tied to his movements. I don’t see this in other colors, and I do see it in the scopes. I don’t recognize it as moire, but maybe it’s a weird variation? I’ve tried hue and sat shifts to no avail. Maybe some interference pattern between the sensor and the somewhat lesser quality LED point source key light. We might have to live with it this time on YouTube, but I sure would like to prevent it in the future. Lumix GH6, 4k, 10b 422 All-i on a 1080 timeline. I’ll try a quick export and see if the downsampling makes a difference. Any thoughts?

EDIT: did a 1080 export, high bitrate. still shifting- sometimes between blue and teal, and the dark denim pants would bounce between blue and purple. Importantly, I noticed a constant slight pulsing in the focus, very subtle but present; I must have neglected to turn off the [contrast detect] AF. Seems related or even causative?