First check would be the air bags,sounds like one is leaking.Soapy water the air bags especialy the area where they fold under themselfs.Get it sorted sooner rather than later as you could burn out the compressor if left to long.
sounds like self levelling to meThanks guys. Will do! One thing I have to mention that I forgot. When I stop the car and lock the door, I sometime hear a click underneath the car and than the rear suspension deflates. This sounds like the remote gizmo to lower the rear is acting on its own. Is there something I could check? Can I disconnect this or something to check? Where would that be located? (sorry: newcomer to the Rover world)