can someone help me out what is wrong in this code?

this script was working fine. untill i modified to add camera collision. my code was fine i got the result, i wanted to achieve i.e my mouse would rotate around the character freely(orbit). then i modified the script to add camera collision. now it is causing shaking camera movement. please note i have also different script in my camera to keep looking to my character.

     {
     public Transform target;
     public Transform target1;      // this is for collision purpose use player here
     public float distance = 10.0f;
 
     public float xSpeed = 250.0f;
     public float ySpeed = 120.0f;
 
     public float yMinLimit = -20f;
     public float yMaxLimit = 80f;
 
     private float x = 0.0f;
     private float y = 0.0f;
 
     public float moveSpeed = 5;
     public float returnSpeed = 9;
     public float wallPush = 0.7f;
     public float closestDistanceToPlayer = 2f;
     public float evenCloserDistanceToPlayer = 1f;
 
     public LayerMask collisionMask;
     private bool pitchLock = false;
     public Vector2 pitchMinMax = new Vector2(-48, 85);
     float pitch;
     Vector3 currentRotation;
     public float rotationSmoothTime = 8f;
     Vector3 rotationSmoothVelocity;
 
 
     // @script AddComponentMenu("Camera-Control/Mouse Orbit")
 
     void Start()
     {
         var angles = transform.eulerAngles;
         x = angles.y;
         y = angles.x;
 
         // Make the rigid body not change rotation
         if (GetComponent<Rigidbody>())
             GetComponent<Rigidbody>().freezeRotation = true;
     }
 
     void LateUpdate()
     {
         if (target)
         {
            var position = new Vector3(0.0f, 0.0f, -distance) + target.position;
            CollisionCheck(position);
             if (!pitchLock)
             {
                 x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
                 y -= Input.GetAxis("Mouse Y") * ySpeed * 0.02f;
 
                 y = ClampAngle(y, yMinLimit, yMaxLimit);
 
                 var rotation = Quaternion.Euler(y, x, 0);
               //  var position = new Vector3(0.0f, 0.0f, -distance) + target.position;
 
                 transform.rotation = rotation;
                 transform.position = position;
             }
             else
             {
                 x += Input.GetAxis("Mouse X") * xSpeed * 0.02f;
                 pitch = pitchMinMax.y;
                 currentRotation = Vector3.Lerp(currentRotation, new Vector3(pitch, x), rotationSmoothTime * Time.deltaTime);
             }
         }
     }
 
     private void WallCheck()
     {
         Ray ray = new Ray(target1.position, -target1.forward);
         RaycastHit hit;
         if (Physics.SphereCast(ray, 0.5f, out hit, 0.7f, collisionMask))
         {
             pitchLock = true;
         }
         else
             pitchLock = false;
     }
 
 
     private void CollisionCheck(Vector3 retpoint)
     {
         RaycastHit hit;
         if(Physics.Linecast(target1.position, retpoint, out hit, collisionMask))
         {
             Vector3 norm = hit.normal * wallPush;
             Vector3 p = hit.point + norm;
 
 
             if(Vector3.Distance(Vector3.Lerp(transform.position, p, moveSpeed * Time.deltaTime), target1.position) <= evenCloserDistanceToPlayer)
             {
 
             }
             else
             {
                 transform.position = Vector3.Lerp(transform.position, p, moveSpeed * Time.deltaTime);
             }
             return;
         }
 
         transform.position = Vector3.Lerp(transform.position, retpoint, returnSpeed * Time.deltaTime);
         pitchLock = false;
     }
 
 
 
     static float ClampAngle(float angle, float min, float max)
     {
         if (angle < -360)
             angle += 360;
         if (angle > 360)
             angle -= 360;
         return Mathf.Clamp(angle, min, max);
     }
 }