muckles:
It might be the Ride height control module, not sure what it’s proper name is, it’s the blackbox on the chassis that has a connecting rod to the axle, might be 2 of them on a 6x2 one for each rear axle.I had a similar problem with an FH, and somebody posted a similar problem on here with another Premium a couple of month ago.
You’ll need to do a search for it.
It was the suspension arm that hadt ge replaced. £660 all in from local renault dealer. Had to get put on the diagostics which only they have to eliminate any other causes. Al good now though. Thanks.