404 error usually occurs in my application, when back button clicked or long time inactivity

@snapey thank you for your response

the student module have only 4 nav bars.

dashboard,   -- xyz.com

exam list,	-xyz.com/ExamList	

 exam summary,   -- xyz.com/ExamSummary

logout   - to logout the application

but i dont know how the url changes to xyz.com/home so do i need to write something for this?? then where i should write what changes i have to do?

but you don't say if /home is a valid Route? -> if this is the reason then in route what i should write

Route::get('/', 'HomeController@index')->name('home'); this is the reason for that error??

@snapey yes iam not clear about valid routes. kindly guide me whats the mistake what i should do now?

till now i get confused that how it changing xyz.com/home

kindly point out whats wrong with me in this portion

@snapey @sinnbeck

my laravel version is - Laravel Framework 6.18.0

and app\Providers\RouteServiceProvider.php file

<?php

namespace App\Providers;

use Illuminate\Foundation\Support\Providers\RouteServiceProvider as ServiceProvider;
use Illuminate\Support\Facades\Route;

class RouteServiceProvider extends ServiceProvider
{
    /**
     * This namespace is applied to your controller routes.
     *
     * In addition, it is set as the URL generator's root namespace.
     *
     * @var string
     */
    protected $namespace = 'App\Http\Controllers';

    /**
     * The path to the "home" route for your application.
     *
     * @var string
     */
    public const HOME = '/home';

    /**
     * Define your route model bindings, pattern filters, etc.
     *
     * @return void
     */
    public function boot()
    {
        //

        parent::boot();
    }

    /**
     * Define the routes for the application.
     *
     * @return void
     */
    public function map()
    {
        $this->mapApiRoutes();

        $this->mapWebRoutes();

        //
    }

    /**
     * Define the "web" routes for the application.
     *
     * These routes all receive session state, CSRF protection, etc.
     *
     * @return void
     */
    protected function mapWebRoutes()
    {
        Route::middleware('web')
             ->namespace($this->namespace)
             ->group(base_path('routes/web.php'));
    }

    /**
     * Define the "api" routes for the application.
     *
     * These routes are typically stateless.
     *
     * @return void
     */
    protected function mapApiRoutes()
    {
        Route::prefix('api')
             ->middleware('api')
             ->namespace($this->namespace)
             ->group(base_path('routes/api.php'));
    }
}

So what should i do now??