How can i make 2 different shuffled arrays from an initial array in javascript?

When i execute my code the 2 shuffled arrays are always the same. I want my initial array to be unchangeable and the 2 new arrays to be differently shuffled.

Thank you!

const array = [
{
 name: "Nick",
 age: 15,
 grade: 18
},
{
 name: "John",
 age: 16,
 grade: 15
},
{
 name: "Patrick",
 age: 13,
 grade: 11
},
{
 name: "George",
 age: 15,
 grade: 19
}
];

console.log(array);

function shuffle(array) {
 let currentIndex = array.length,  randomIndex;

 while (currentIndex != 0) {

  randomIndex = Math.floor(Math.random() * currentIndex);
  currentIndex--;

  [array[currentIndex], array[randomIndex]] = [
    array[randomIndex], array[currentIndex]];
 }

  return array;
 }

 let array1 = shuffle(array);
 console.log(array1);

 let array2 = shuffle(array);
 console.log(array2);