A883 2nd & 3rd question

It has been doing this since I have had the car, about 6k. Usually happen if I am in 2 or 3 only on deceleration.
I have adjusted nothing.....yet.

Everything I posted above still applies, but jumping out of gear on deceleration is usually a worn gear or shaft where the gear rides on it.

(Wear allows the gear to move around on it's shaft when you let off the gas and it falls out of the slide ring)