How to choose a color randomly from the list? - unity3d

Question

Unity C#
I made a list. The color changes after 5 seconds. I defined the color from which the list begins ("_currentIndex = 0"). The first color should always be the one I defined at the beginning. What I have means that each color on the list is selected one by one. After the last color everything comes back to the beginning.
I would like the first color to always be the same, but each subsequent one was chosen randomly from the list. It must be an infinite loop.
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ColorCycler : MonoBehaviour
{
public Color[] Colors;
public float Speed = 5;
int _currentIndex;
Camera _cam;
bool _shouldChange = false;
private int randomColors;
void Start()
{
_cam = GetComponent<Camera>();
_currentIndex = 0;
SetColor(Colors[_currentIndex]);
}
public void SetColor(Color color)
{
_cam.backgroundColor = color;
}
public void Cycle()
{
_shouldChange = true;
}
void Update()
{
if (_shouldChange)
{
var startColor = _cam.backgroundColor;
//start from color with number
var endColor = Colors[0];
if (_currentIndex + 1 < Colors.Length)
{
endColor = Colors[_currentIndex + 1];
}
var newColor = Color.Lerp(startColor, endColor, Time.deltaTime * Speed);
SetColor(newColor);
if (newColor == endColor)
{
_shouldChange = false;
if (_currentIndex + 1 < Colors.Length)
{
_currentIndex++;
}
else
{
_currentIndex = 0;
}
}
}
}
}

Answer 1

If you just want a random element from a list then just choose a random index.
Random random = new Random();
int randomIndex = random.Next(Colors.Count);
color = Colors[randomIndex];