Standard problem with European manufactured coil springs in all makes and models from Citroens to Mercedes. The springs are not properly wound or tapered at the ends to spread loads, nor are they seated properly, nor are they adequately protected from corrosion. So when corrosion starts to attack the bases of the springs they become
vulnerable at the weakest point and are usually finished off by a speed hump that sets up a stress fracture that usually snaps the spring first thing in the morning when it is at its coldest.