13" mid 2012 macbook air experiencing video artifacts...known problem?

My macbook air is randomly showing video flaws, screwed up parts of the screen, seems to be on startup, not so much after it warms up. happens on the desktop, or in foxfire, or in video games, happened before and after updating to el capitan. sometimes sections of the screen flash. Is this some known flaw? is there perhaps some some campaign to provide a repair? of course, my 3 year apple protection plan just expired 🙂