In any case, the files are corrupted somewhere between the camera and the computer. Only you can determine what is wrong, by changing cards and seeing if it stops, or by transferring the images from the same card, repeatedly, using different methods and hardware (cables, card-reader, computer, and LR vs Finder/Explorer to transfer) and see if any of those changes make a difference in how many or which images are corrupted. If one of the things you change does change which or if the images are corrupted then maybe you have found what the problem is. Most likely it is the card going bad, but it is possible the camera, or one of the components involved in the transfer is also bad up to and including memory or the hard-disk in the computer.
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