This keeps happening as of 20th Feb.
I've had the FD disconnect about 3 times during my flight today.
As recommended, Ive unbounded all the keyboard controls, including flight control surfaces bindings.
Please look into this.
Ive just had this happen to me as well.
I was looking forwards to get the a350 on release. But with these issues persisting on all planes, I can assume it will happen to the 350 as well.