A321LR - nose bobbing up and down throughout cruise

[BoeingSpeedbird]

First time flying a321. During cruise the nose is bobbing / rocking constantly up and down and the trim wheel is constantly moving. If I disengage autopilot, the problem goes away. But this is not usual behaviour. Nothing like this in the a320. 

Edited June 20 by BoeingSpeedbird

[BoeingSpeedbird]

Sorted in.10 beta update.