Yeah, I had one that DJI replaced that was exhibiting the same issue, purple bands in the recorded video.In my case it was a faulty canera, replaced under warranty (P3P).
The lines apprared as acattered random purple however when i zoomed in it was obvious that while parts of the image.had been shifted elsewhere in the image.
flyNfrank, Did you have the same issue as me ?
Am thinking of buying a working used camera from ebay and replace myself.