How to save state of fragment with BottomNavigationBar?

I have BottomNavigationBar with five tabs. In that fragment, I'm loading data from the server. My issue is that Fragment each time loads data on changing tab. I don't want to load data every time.

I know it can be possible using onSaveInstanceState(), but it is useful to save a small amount of data.

And one thing, There is all fragments in-app, so can't get any solution for my problem. Any help would be appreciated

MainActivity:

 private boolean loadFragment(Fragment fragment) {
    if (fragment != null) {
        getSupportFragmentManager()
                .beginTransaction()
                .replace(R.id.fragmentContainer, fragment)
                .commit();
        return true;
    }
    return false;
}