Could you please let me know the exact version of Lightroom installed on your computer?
Also which operating system are you working on, Windows or MAC?
Are you getting these lines when exporting any image from Lightroom or does these lines show in Lightroom library module as well?
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THere is a hardware malfunction that is causing your photo files to be corrupted.
If the photos look fine in Lightroom but look like this when exported, you most likely have a malfunctioning hard disk (or possibly computer memory).
If the photos look corrupted before you export, then you need to try importing the photos using different hardware (different card reader or different USB cable/USB port), run diagnostic tests on your hard disk and computer memory; and if possible try importing the photos to an entirely different computer.
Both. version Lr CC 2015.5.1
Thank you for the information, as suggested by dj_paige it seems an issue with the hardware on the computer, mainly the Graphic Card I can think of.
Try the steps suggested by dj_paige.