Hi,

I followed your advice and disabled the joystick. That changed nothing.
The pitch oscillations are still there.
So it's not a joystick noise problem.
It is also not a center of gravity problem as I use ACE for initialisation.

To be absolutly clear: the problem exist's only when the altitude hold/elev.diconnect switch
is in the middle position (use of AP trimwheel).

I tried to follow the problem a bit more closely during three short flights now, climbing
each time to 35000 feet.

1)The pitch oscillations are there each time I use the trimwheel but generally they are
very light only and not disturbing.

2)During the 3 climbs I ended up three times with very heavy up and down shaking. Two times
I had moved the trim wheel and once it started all by itself (without changing wind conditions).

3)the wild pitch oscillations start EACH time when I INITIATE THE DESCENT from cruise altitude (35000 ft) by
positionning the altitude hold switch from the upper to the middle postion (even without touching
the trimwheel). So this is REPRODUCABLE (at least for me)
I cannot use this middle position (trimwheel) as long as I am above 30000 feet during descent.
So I have to move the switch to the lower position (elevator disconnect) and control the descent
manually.
Below 30000 feet I can then use the trimwheels again.

4)during descents I got the wild oscillations also 3 times while moving the trimwheel and once
it started all by itself again (also without changing wind)

By "wild pitch oscillations" I mean that the plane would have run completly out of control.
When I disconnect then the elevator control   it goes into a steep dive or climb .
I  have to stabilise it manually before reconnecting the elevator.

Otherwise I like the beautiful model, the nice VC and the easy manual flying.

Guy