Collision alert system flashes red and the equinox brakes grab on and off, sometimes once and sometimes several times for no apparent reason - distance from other vehicles ahead is more than adequate, speed is moderate, no approaching cars. it seem that the system taps the brakes and then releases . this has happened 5 to 6 times even when no vehicles are in front and the driving conditions are normal - roads clear and dry, some overcast, no cars approaching from the other lane. the dealer is at a loss as to what is causing this. *tr