-I upgraded about a year ago. I just upgraded them to try and solve the problem, but no such luck.
-Erasing the dust and trails did not solve it either, nor does shutting them off completely.
-It never seems to happen when its on bounce, though setting it back to bounce does not fix the problem.
As for overheating, I don't think it is. It gets hot eventually if I run the 250 moons sim, but it glitches way before then, and I've got a big card fan blowing on it.