I am experiencing a stability problem on a straight road at moderate speeds of say 100mph. Sometimes, the car seems to sway from side to side but not always. This also seems to happen when braking hard as well. I have already checked the tyre pressures and conditions. The front tyres have about 4mm treads left (P Zero) and the rear ones are almost new (Bridgestone Potenza S-02). A full suspension alignment was carried out by a Ferrari specialist about 3k miles ago. There is no noise coming from the front end to indicate any problems. However, when the steering is on full lock for parking, some front end parts of the car rubs against each other. I am suspecting the common ball joints wear, do you have any other ideas?