Comment 2 for bug 190615

Makes sense, it's probably not directly an issue with 3D, but simply shows up there more often do to button mashing. Maybe it's something to do with that, as it's almost always my arrow keys while in a game, those are generally pressed frequently, or held for long period of time, most frequently it is "up" which is simply held most times. Assuming your issues are the same, which it seems at least crazily similar, we can rule it out as an nVidia bug.