My InDesign will not keep links to some images. I am using InDesign to create catalogues and often have 1,000 images. I am using Winodws 10. All of the images are saved on a network drive with a mapped drive letter. The locations of the images do not change and they are not edited in any way while my InDesign document is closed. But when I reopen, I find some or sometimes all of the images have lost their links and I have to relink them all again to the exact same path/location.