was returning back to base. had a right elevator shot off. noticed that my remaining drone would not stay with me as i would drift a little due to the damage. then as i started to lower my altitude to land, the drone stayed at altitude and would not follow me down. climbed to stay with it and then slowly dove again but it would not stay with me. finally it was far enough away (above me) that it exploded. formations are a real problem that needs to be addressed.