GameObject1 move away when GameObject2 gets close

I currently have a script which (in 2D space) tells my enemy GameObject to chase after my target (the player). I want it so when the enemy gets too close or when the player moves towards it, it dodges out of the way.

In my code I effectively just said the opposite of the 'chase' code (so when it gets too close, move in the opposite direction of the players location).

When I test it, the enemies:

1. move towards the player normally (which is fine)

2. as soon as they hit minimum distance they immediately move back to their original location

3. if I DO manage to move my character on top of one it flickers constantly

Any ideas? Is there another function that will allow for just moving in a random direction AWAY from the target when I'm within a certain range?

Thanks guys!

 using UnityEngine;
 using System.Collections;
 
 public class GuardianKnightMeleeController : MonoBehaviour
 {
     public Transform target;
     public float speed = 5f;
     private float minDistance = 3f;
     private float range;
 
     void Update()
     {
         range = Vector2.Distance(transform.position, target.position);
 
         if (range > minDistance)
         {
             transform.position = Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
         }
 
         if (range < minDistance)
         {
             transform.position = -Vector2.MoveTowards(transform.position, target.position, speed * Time.deltaTime);
         }
 
     }
 }