The 2024 Subaru Crosstrek brakes engaged TWICE without the driver pushing on the brakes, slowing the car down significantly. The initial vehicle speed was around 65 mph on the highway, and slowed to around 45 mph after the second automatic braking incident occurred. Adaptive cruise control was NOT on. The car in front of the Crosstrek was 8-10 car lengths away. Then while the Crosstrek was still moving, a truck hit the back right bumper of the Crosstrek and pushed it into the next lane to the left. (I), the driver of the Crosstrek, was able to steer back into the original lane of travel to the right. After the Crosstrek was steered back to the original lane of travel, it came to a stop due to right rear axle damage. The Crosstrek driver was able to creep to the shoulder to wait for emergency personnel to arrive. The safety of myself and others, due to the Crosstrek (Eyesight?) malfunction, is extremely important to investigate. This safety feature when engaged unexpectedly is dangerous. When drivers do not have control over the braking system of the car, sudden and unexpected slow-downs can lead to rear-end accidents, and even the loss of life. When I was pushed to another lane of travel, a secondary accident could have occurred, or a chain-reaction with many cars. I did not see or hear any warnings, messages, or experience any unusual symptoms before the car braked on its own and I was rear-ended. After I crept to the right shoulder of the interstate, the Crosstrek wa