Chrysler voyager front rotor clicking sound on acceleration and decelleration?

2010 touring chrysler awd 50,000 miles

roaring noise

when accelerating and/or

going up grades

When sitting still and reving rpms to 50-60mph range

when going slow 20-30 miles/hr--one time--terrible noise--I stopped the car

started accelerating again a slow speed with no noise

six months ago it started doing this--lasted 3/4 weeks and stopped