Lightroom 5.2 import

Hi gang,
I experienced some unusual behavior lately when I import pictures in Canon - Raw (.cs2) format and this behavior seems to affect the original file...
Camera is a Canon Rebel T3i and I shoot in Raw-mode.
What happens is that the preview thumbnails show color artefacts or even completely discolor the image as shown in the picture below:
Both, Lightroom and Camera Raw are updated to their latest versions. I use the CC products on a Win7 Pro machine with 2GB of video ram and 12GB of computer ram.
If I hit the "Develop" button for any given image, the color artefacts or discoloration is still there, so I presume that the original has been overewritten and thus destroyed.
If I try to open the same file directly from within Photoshop CC, I also see the discoloration.
Has anybody else experienced this phenomenon and knows a work around? I don't want to loose any more pictures...
Thanks in advance,
Erhard

dj_paige and twenty_one:
Thanks for your help, guys. I found the culprit.
The problem was indeed intermittent, as dj_paige suggested and so it could not be LR or camera raw but must be hardware related as you both suggested. I apologize for sounding hysterical :-)
After taking some photos with different SDHC cards, I found that the card originally used was corrupt. So I did a low level format on the computer, and after that, a low level format in the camera. After installing Magic Lantern on the camera, I took new test photos, and voila - everything works fine again.
The Sandisk card was the last I supected but when reading through a couple of other fora, I found out that SDHC cards larger than 16GB are prone to get corrupted over time, especially when you shoot a lot if pics and simply move them to your computer without formatting the card afterwards...
Thanks again and have a nice weekend,
Erhard

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