A350 V.1.2.1 - aircraft rolls like a crazy when pushing x4 time acceleration

[Nimic]

This happened after the latest update. I am on FS2020

The A/P then turn off and the aircraft goes in a dive.

I had this problem on the very first release of this plane, but then it had been ironed out after 2 or 3 updates. But here we go again. It's frustating, I paid 68 € for this? 

I can't fly the aicraft with 4x acceleration, that means I should seat in front of the PC for at least 4 hours for a long-haul flight. It's unbearable.

I can't accept it, especially because it looks like, instead of going forward, we are going backward.

 

Edited 5 hours ago by Nimic