Gradien Skyboxes problem

Hi, I'm creating a simple game where I would like to have a gradient background with shifting colors and so I have done, and it works in the beginning. But After a while it looks really bad, the colors aren't correct, there's no blend and the colors get "stuck". Does somebody now why? I have tried both skybox, plane and different shaders.

This is my color controller: [code=CSharp]using System.Collections; using System.Collections.Generic; using UnityEngine;

public class GradientController : MonoBehaviour {

 private Material gradientShader = null;

 private Color currentColor0 = Color.white;
 private Color currentColor1 = Color.white;
 private Color targetColor0 = Color.white;
 private Color targetColor1 = Color.black;

 private readonly string COLOR_ONE = "_Color1";
 private readonly string COLOR_TWO = "_Color2";

 private readonly float LERP_SPEED = 0.5f;

 private readonly float COLOR_INCREMENT = 0.01f;

 private void Start()
 {
     gradientShader = RenderSettings.skybox;

     currentColor0 = RandomColor();
     currentColor1 = RandomColor();
     targetColor0 = RandomColor();
     targetColor1 = RandomColor();
     gradientShader.SetColor(COLOR_ONE, currentColor0);
     gradientShader.SetColor(COLOR_TWO, currentColor1);
 }

 void Update ()
 {
     currentColor0 = Color.Lerp(currentColor0, targetColor0, Time.deltaTime * LERP_SPEED);
     currentColor1 = Color.Lerp(currentColor1, targetColor1, Time.deltaTime * LERP_SPEED);

     gradientShader.SetColor(COLOR_ONE, currentColor0);
     gradientShader.SetColor(COLOR_TWO, currentColor1);

     targetColor0 = ShiftColor(targetColor0);
     targetColor1 = ShiftColor(targetColor1);
 }  

 private Color RandomColor()
 {
     return new Color(
         Random.Range(0.1f, 0.9f),
         Random.Range(0.1f, 0.9f),
         Random.Range(0.1f, 0.9f)
     );
 }

 private Color ShiftColor(Color start)
 {
     float minIncrement;
     float maxIncrement;
     float value;

     float[] colors = new float[]{ start.r, start.g, start.b };
     for (int i = 0; i < colors.Length; i++)
     {
         value = colors[i];
         minIncrement = value > COLOR_INCREMENT ? -COLOR_INCREMENT : 0;
         maxIncrement = value < 1 - COLOR_INCREMENT ? COLOR_INCREMENT : 1;
         value += Random.value <= 0.5f ? minIncrement : maxIncrement;
         colors[i] = value;
     }

     start.r = colors[0];
     start.g = colors[1];
     start.b = colors[2];

     return start;
 }

} [/code]

And in the beginning it looks like this: (Correct) https://imgur.com/fL0sSwl then like this: https://imgur.com/chaZcKP