Wallpaper background photo flashing (in green areas) after charging, static?

When I have a photo wallpaper, the green colours seem to flash or flicker a few times a second,
slightly brighter then less bright or maybe like the sharpness is increasing harshly and decreasing, or a resolution moving between two resolutions

Tried quite a few different images but all ones taken on this Fairphone 4

Doesn’t happen if I have a default wallpaper rather than my own photo

I think may only happen once I have charged the phone not after a restart? When I put it on charge, I get a row of static / white pixels flicker up the screen then disappear.

Have seen both these occur on two/three different screen modules in this phone now

The screen otherwise works fine…

What sure what else to try! Anyone else seen it? Any suggestions? Thanks