You are probably right Wolf, 270 degrees turn is not much, but between
2.11.35z 2.12.15z they are stalling and turning right between 16 and 40 bank and the VSI gets its higher values, even unreliable. At that monent IDLE thrust is selected producing a pich down moment that stops the stall of the right wing stoping the rotation but mantaining the Stall.
Worse of all Wolf is that no investigation will solve this.