Same here, wanted to do DOH-MIA for 2 straight days, one time AP disconnected 5 hours into the flight, and now after 13 hours it did it again, both flights on the -1000, never had the problem on the -900, I must say on every -900 flight I was near the sim for the whole flights, on the other hand on the -1000 flights in the first case I found it spinning in the morning and now I checked my flight on Volanta and it keeps spinning over the East Coast. No assists turned on, using Thrustmaster airbus stick with a pretty big dead zone, so I wouldnt consider there was any input that would make the AP disconnect