Set pixels to 4 or 5.  It slows down render times, but it's worth it if it gets rid of the crappy glitches.  Mine is set for 5 and haven't had problems for a long time..

I cannot save the world. Only my little piece of it. If we all act together, we can save the world.--Nelson Mandela
An  inconsistent hobgoblin is the fool of little minds
Taking "Just do it" to a whole new level!