AHhhhhaaa. In RVSM airspace if the autopilot starts taking you down-uncommanded-shouldn't you disconnect and fly manually. If you were asleep for the first 200 foot excursion you should have been focused by then to disconnect for the next 650' excursion! And even more focussed after that for the next 400' excursion. Believe it or not you can disconnect the autopilot in cruise on a 'bus.