2D Sprite constantly flipping

I posted a question yesterday and somehow fixed my issue but a new one came up. Basicly my sprite is constantly flipping at a certain mouse point. I don't really know how to resolve this. Here's the code, and down blow a small clip of the issue.

 void Update()
 {
     move.x = Input.GetAxisRaw("Horizontal");
     move.y = Input.GetAxisRaw("Vertical");

     animator.SetFloat("Speed", move.sqrMagnitude);

     // using mousePosition and player's transform (on orthographic camera view)
     var delta = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;

     if (delta.x >= 0 && !facingRight)
     { // mouse is on right side of player
         transform.localRotation = Quaternion.Euler(0, 0, 0); // or activate look right some other way
         facingRight = true;
     }
     else if (delta.x < 0 && facingRight)
     { // mouse is on left side
         transform.localRotation = Quaternion.Euler(0, 180, 0); // activate looking left
         facingRight = false;
     }
 }

Thats the one from the player object and here's the code from the gun pivot.

public GameObject myPlayer;

 private void FixedUpdate()
 {

     Vector3 difference = Camera.main.ScreenToWorldPoint(Input.mousePosition) - transform.position;

     difference.Normalize();

     float rotationZ = Mathf.Atan2(difference.y, difference.x) * Mathf.Rad2Deg;

     transform.rotation = Quaternion.Euler(0f, 0f, rotationZ);

     if (rotationZ < -90 || rotationZ > 90)
     {
         if (myPlayer.transform.eulerAngles.y == 0)
         {
             transform.localRotation = Quaternion.Euler(180, 0, -rotationZ);
         }
         else if (myPlayer.transform.eulerAngles.y == 180)
         {
             transform.localRotation = Quaternion.Euler(180, 180, -rotationZ);
         }
     }
 }

I would really appreaciate some help. Thanks in advance.