'brake' statement makes Unity hang ?

Can someone explain why this code makes Unity hang?

This tries to find a non-intersecting position for objects generated. 'prefab' is a common Unity sphere which size is set to (50,50,50). Default 'SphereCollider' is set to 'isTrigger' (just in case).

I suspect 'break' call being a problem, because I have experienced strange behavior of 'return' call.

Important note: CalcPositions() works without 'hang' problem in other engine!!!

Any help would be much appreciated.

Here is the code:

 public GameObject prefab;    //sphere of size (50,50,50)
 GameObject[] go;            //array of these spheres
 int Count = 3;                //size of array
 float ObjectRadius = 50;    //scalar of sphere size
 float SceneRadius = 250;    //area of position value generation
 Vector3 pos = new Vector3(0,0,0);
     
 void Awake () {
     go = new GameObject[Count];    //init of array
     Generate ();                //generating objects
     CalcPositions ();            //calculating positions
 }
     
 void Generate () {
     for (int i = 0; i < Count; i++) {
         Quaternion rot = Quaternion.identity;
         go[i] = Instantiate (prefab, pos, rot) as GameObject;
     }
 }
     
 void CalcPositions () {
     int j = 0;
     for (int i = 0; i < Count; i++) {
         Pos.x = Random.Range (-SceneRadius, SceneRadius);
         Pos.y = 0; Pos.z = 0;
         while (j < i) {
             for (j = 0; j < i; j++) {
                 Vector3 tempPos = go[j].transform.position;
                     if (Vector3.Distance(tempPos, Pos) < ObjectRadius) {
                         break;
                     }
             }
             Pos.x = Random.Range (-SceneRadius, SceneRadius);
         }
         go[i].transform.position = Pos;
     }
 }