On four occasions now, the car slammed on the brakes as if the collision detection system was going off. Someone did almost hit me from behind as they needed to slam on their brakes due to my cars collision system going off when not supposed to. This has been well documented with cadillac and the leased vehicle has been back in the shop 4 months out of the year we owned it. It is a major safety issue and am very concerned it will happen at a time that may cause a bad accident, injury or loss of life if something is not done. Cadillac has replaced many electrical parts and tells us it is fixed when in fact it is not and it happened again this week and will be going back to the shop for the 5th time next week.