Hi Guys,
I have a little metal demo model that I use for showing the Weatronic versatility at shows. I too noticed that the servos that are attached to the Gyro function have a jitter every once in a while, especially if the model is not resting on solid surface. Turns out that the movement of the control surfaces is causing a very small rotation moment that in turn reacts through the receivers Gyro to over counter react and keep the jitter going. Once I take the gain down or set it on a more solid or damped surface, it stops immediately.
A model standing on its gear with the tires etc. can be very sensitive or springy in that respect.
Support both wings on something solid and it should disappear.

Gerhard