Erratic movement shifting shimmering colors w/ brilllant white at center

Colorful (red, blue, green) flickering sphere with brilliant white center appears in the night sky for various durations , mostly in the western sky but have observed the object appear in the eastern and southern sky . It appears to move erratically in different directions and moving at indistinct distances returning to its original position of first sighting . Disappears at random . Observed the object many times over periods of months . No evidence of exhaust no sound detected . First impressions were possibly a planet or star but motion, color changes , and dramatic change of position suggest otherwise. Observed during night with clear empty background , both during bright moonlight and new moon periods .