Realizing I am talking about Reflect v6, after literally hundreds of restores I've not seen any change in file placement take place. PD has a utility called defraggler. It can scamble the disk in seconds. I took one image while it was running. When I restored an image from before that the image was almost perfectly defragged. Then when I restored the defraggled image it showed the disk as exactly as it was when taken. So on v6 I've not seen anything remotely what you are describing.