Bright white or silvery round shape traveling erratically then flying straight down before vanishing

At first the circular shaped object or craft was traveling erratically darting side to side at an extremely high rate of speed . Then it slowed down a bit and almost Seemed to “falling” directly down to earth. It then suddenly started fading so it was barely noticeable then it simply vanished. There were no clouds in the sky and it Was broad daylight. It was difficult to tell the size of the craft and difficult to tell it was spherical or round and flat . It was a bright white color and could have been metallic. I am a trained law enforcement officer who is presently retired so my account is credible.