Screen Distortions and Freezes

I recently started having a problem with my Macbook Pro where the screen would suddenly split and flip sides. I could still move the mouse but nothing else responded so I would have to shut it down. It started happening more frequently and then got to a point where it couldn't even get to the log in screen when restarting. I took it to an Apple Service Provider and they replaced the logic board. It had no problems for about two weeks, but now the issue has returned. There is no obvious pattern that predicts when the screen will distort. It seems different every time, and sometimes the screen just goes black. What is likely the issue since the logic board replacement seems to have been unsuccessful?
Interestingly, the most recent time it happen, I took a screenshot of the split and flipped screen, but in the image, the screen looks normal.

Did you ever figure out the cause? Mine just started doing the same thing. (Late 2011 macbook pro 15 inch)

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