Now, before you say:
It’s bobbing so turn off the ALT
No senors and senoritas, my problem with the A321 is much different. Below is my evidence.
Note that this was on left downwind at OTHH, altitude obvious. I never set my VS lower than -1000 at this stage of the flight. But as the video goes on, you can see the VS is trickling down slowly. The huge jolt is when I attempted to reset the VS manually but that failed and the plane did not recover and went back down slowly instead.
I’ve heard the A321 is notorious for this, but I explained this problem to my fellow IFATC contorllers and none have even heard of this.
Device: Ipad 2017
Settings: Graphics for both set to medium
Airplane count to medium
Joystick + LiveFlight connect were active.