Yes it happens even with an approved graphics card and the matching approved driver.
My old VAR suggested disabling the 3GB switch as a cure. It still happens with the 3GB switch on or off and I can't be bothered spending the time logging each time.
Clearly it bugged them enough to look for solutions, so it's not just you, me and our graphics cards/drivers.
Sometimes they go away by themselves, sometimes they require a re-start.
Sometimes triggered by other open applications, particularly those requiring graphics power. Google Earth causes it often as do my other 3D conversion programs.
Sometimes triggered by the computer entering or leaving standby.