Sorry to hear this. One of the automotive magazines had multiple studs break at low milage on a 2017 Impreza they had for a long-term test. They also used a torque wrench.yeah really strange. Im blaming it on the OEM lugs. They werent over torqued because they loosened up easy and got really tight towards the end. Torque wrench was used as well, oh well
It might be worth keeping a set of spare studs in the car.