The pre-collision system was unexpectedly activated for no apparent reason. travelling on the interstate in light traffic on a clear, sunny afternoon, the car brakes suddenly activated, seat belts clinched with no warning sound. this has happened twice in the last year (coincidentally, it occurred at the same area on the interstate). the car was taken, both times, after the incident for inspection at the dealer. the service department was not able to replicate the issue or find any problems. for me, this is a serious safety concern. sudden unexpected severe braking could result in a major rear-end collision.