The only thing I can say is that I updated both mine with last month update, on one I forgot to clear flight data and it did not fly right. It toilet bowled and behaved erratically. I then cleared flight data and recalibrated everything and it flew perfect. With this update I don"t believe it matters since you are not doing anything with the ST16. My dos centavos!
I had the same experienced. Clearing all flight date fixed the erratic behavior after updates.