Shom wrote on Jun 2^nd, 2018 at 5:57pm:

This is in regards to the auto-throttle - the throttle levers jump back and forth when climbing in FLCH mode (quickly, very unrealistic) In regards to the auto-throttle and VS mode - when descending using VS mode and using SPD mode when reducing the speed to be maintained during the descend the auto-throttle can not maintain idle thrust - and jumps instantly to max thrust (and back to idle vice versa...) never managing to reduce the thrust to maintain the desired airspeed.

This could be caused by the throttle resistors noise. Please try to unplug the throttles.