Hello, i have a problem with the a320. When i‘m starting the descend the Aircraft slows down as Long as the A320 Comes into Stall Themen it is acceleraring. When i set the speed manual it is descending constant  with 1000ft per Minute. I can see the green point which shows the path, but the plane isnt following. I have to set the descend rate and the Speed in the approach manual now.