Hiya, I'd love some advice from you guys. My 2008 500 lounge is playing up every so often. Occasionally, when turning the car, the steering goes very stiff and a message comes up to say 'have power steering checked'. When I pull over and turn the car on and off, it comes back fine and is ok until next time. There's no warning lights on, and my local mechanic (who's great) plugged it in and said it was coming back as showing no faults. The car is very low mileage (34k) and serviced well so I don't think it's too worn out. It's putting me off driving on any fast roads presently, and has happened five times. Any thoughts about what to do?