Rigidbody z position will not stay 0

When my rigidbody moves it's z position will not stay at 0. It should only move on the x and y positions. I have z rotation and z position constraints ticked on the rigidbody? Any ideas?

Code (csharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class MoveAstroids : MonoBehaviour {
5.  
6.     public int astroidSpeed;
7.     public bool canMoveAst;
8.     // Use this for initialization
9.     void Start ()
10.     {
11.    
12.     }
13.    
14.     // Update is called once per frame
15.     void Update ()
16.     {
17.  
18.  
19.         if(transform.position.z >=.1 || transform.position.z <= -.1){
20.             transform.position = new Vector3(transform.position.x,transform.position.y,0.0f);
21.         }
22.         transform.Translate(Vector3.left * Time.deltaTime * astroidSpeed); //move the obj
23.  
24.    
25.    
26.    
27.    
28.    
29.    
30.     }
31.  
32.  
33. }
34.  

 

Hi,

Have you tried to put it in "void LateUpdate()" ?

 

negative ghost rider! Any other ideas?

 

Is its collider hitting something else maybe? I just put your script on object and work just fine, no z movement at all.