Is the vertical line always at one location ? (on the screen)
If so, it appears that the video card/driver (on your PC or laptop) may be causing the line to appear occasionally ... i.e. flaky ... and it will likely fail (completely) in due time. To confirm it's the video card, try using another monitor (long enough) to see if it happens.
[ The line may also be caused by "dead" pixel on the screen ... but this usually happens on randomly located pixels on the screen, not on one vertical line. But, it may also be a possibility ... in which case, using a different monitor may prove it one way or the other ]
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