2009 V70, on 3 occasions all the windows opened while the car was parked, locked and unattended. Alarm did not go off. The doors remained locked and the only way to get the windows back up was to insert the key and press start and then the controls start working to allow raising the windows. Local dealer found no obvious fault. Am I the only person to have had this happen? If not how can it be fixed and let us feel secure when we leave the car parked.