Hi
usually on these if theres a fault, if it has cats active damping, the suspension will default to hard setting until the fault is cleared
you need to plug in and see if theres any faults, ideally with Jaguar IDS/SDD, but Icarsoft LR V2 or V3 will do it quite cheaply and worth having for any other faults, generic code readers will only read engine faults and nothing else.
but could be a range of things, hard to say with out plugging in
cheers
Joe