SINCE THE VEHICLE'S PURCHASE, IT WOULD OCCASSIONALLY HYDROPLANE ON SLIGHTY WET SURFACES AND GO TO THE LEFT. APPROXIMATELY THREE MONTHS AGO THE VEHICLE ABRUPTLY HYDROPLANED FROM THE RIGHT LANE OF THE FREEWAY TO THE LEFT WITH NO WARNING. THE LAST INCIDENT ENDED IN A CRASH. WHILE TRAVELING IN A LIGHT RAIN AT APPROXIMATELY 50 MPH, THE REAR OF THE VEHICLE PULLED SHARPLEY TO THE RIGHT WITH NO WARNING. IT FELT AS IF TRAVELING ON ICE. THE VEHICLE SLAMMED HEAD ON INTO THE GUARD RAIL.