Camera shakes when using lerp

Questions
1

when I use lerp to copy the camera position it starts shaking but if I just copy the position there is no shaking
what could be the problem?

( temp = new Vector3())

this is update:
let cameraOffset = new Vector3(-6, 0, -5);
this.temp.setFromMatrixPosition(this.playerContainer.matrixWorld);
let targetCameraPosition = this.temp.clone().add(cameraOffset);
CameraC.cameraContainer.position.lerp(targetCameraPosition, 0.2);