I have a 2005 Jaguar x type 2.5 petrol automatic AWD and has 45000 miles on the clock. It has started to make whining noises at speeds between 20 and 25mph increasing in tone on acceleration and decreasing in tone on decalaration. It does not happen all the time. I have been told it could be prop shaft related. Has anyone else had a similar problem and what needs to be done to rectify same.