Yii2 Ошибка авторизации. Неверный логин и пароль

Ситуация следующая. Достался в работу сайт на yii2. Через некоторое время перестала работать авторизация. Логин и пароль 100% верны, но не пускает. Пишет логин и пароль. В чем может быть ошибка. Помогите, сутки бьюсь. Код ниже.

model - loginForm

<?php
namespace app\models;
use Yii;
use yii\base\Model;
class LoginForm extends Model
{
public $username;
public $password;
public $rememberMe = true;

private $_user = false;

public function rules()
{
    return [
        // username and password are both required
        [['username', 'password'], 'required'],
        // rememberMe must be a boolean value
        ['rememberMe', 'boolean'],
        // password is validated by validatePassword()
        ['password', 'validatePassword'],
    ];
}

public function validatePassword($attribute, $params)
{
    if (!$this->hasErrors()) {
        $user = $this->getUser();

        if (!$user || !$user->validatePassword($this->password)) {
            $this->addError($attribute, 'имя пользователя или пароль не верны');
        }
    }
}

/**
 * Logs in a user using the provided username and password.
 * @return bool whether the user is logged in successfully
 */
public function login()
{
    if ($this->validate()) {
        if($this->rememberMe){
            $u = $this->getUser();
            $u->generateAuthKey();
            $u->save();
        }
        return Yii::$app->user->login($this->getUser(), $this->rememberMe ? 3600*24*30 : 0);
    }
    return false;
}

public function getUser()
{
    if ($this->_user === false) {
        $this->_user = User::findByUsername($this->username);
    }

    return $this->_user;
}

}

Контроллер Site

<?php

namespace app\controllers;

use Yii;
use yii\filters\AccessControl;
use yii\web\Response;
use yii\filters\VerbFilter;
use app\models\LoginForm;
use app\models\ContactForm;
use yii\web\Controller;
use yii\data\ActiveDataProvider;
class SiteController extends Controller
{
public function behaviors()
{
    return [
        'access' => [
            'class' => AccessControl::className(),
            'rules' => [
                [
                    'actions' => ['login', 'error', 'signup'],
                    'allow' => true,
                ],
                [
                    'allow' => true,
                    'roles' => ['@'],
                ],
                [
                'allow' => true,
                'controllers' => ['site/signup'],
                ],
            ],
        ],
        'verbs' => [
            'class' => VerbFilter::className(),
            'actions' => [
                'logout' => ['post', 'get'],
            ],
        ],
    ];
}
public function actions()
{
    return [
        'error' => [
            'class' => 'yii\web\ErrorAction',
        ],
        'captcha' => [
            'class' => 'yii\captcha\CaptchaAction',
            'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null,
        ],
    ];
}


public function actionLogin()
{ 
    $this->layout = 'login';
    if (!Yii::$app->user->isGuest) {
        return $this->goHome();
    }

    $model = new LoginForm();
    if ($model->load(Yii::$app->request->post()) && $model->login()) {
        // echo '<pre>'; print_r($model);
        return $this->goBack();
    }
    else {
    $model->password = '';
    // echo '<pre>'; print_r($model);
    return $this->render('login', [
        'model' => $model,
    ]);
    }
}

public function actionLogout()
{
    Yii::$app->user->logout();

    return $this->goHome();
}

Модель - User

<?php

namespace app\models;
use yii\db\ActiveRecord;

class User extends ActiveRecord implements \yii\web\IdentityInterface
{

public static function tableName()
{
    return 'user';
}

public static function findIdentity($id)
{
    return static::findOne($id);
}

public static function findIdentityByAccessToken($token, $type = null)
{

}

public static function findByUsername($username)
{
    return static::findOne(['username' => $username]);
}

public function getId()
{
    return $this->id;
}

public function getAuthKey()
{
    return $this->auth_key;
}

 public function validateAuthKey($authKey)
 {
     return $this->auth_key === $authKey;
 }


public function validatePassword($password)
{
    return \Yii::$app->getSecurity()->validatePassword($password, $this->password);
}

public function generateAuthKey()
{
    $this->auth_key = \Yii::$app->getSecurity()->generateRandomString();
}

public function attributeLabels()
{
    return [
        'id' => 'ID',
        'username' => 'Логин',
        'password' => 'Пароль',
        'name' => 'Имя',
        'mail' => 'Почта',
        'role' => 'Роль',
        'crm' => 'Доступ к системе учета'

    ];
}

}

И возможно потребуется, создание пользователей через UserController

<?php

namespace app\controllers;

use Yii;
use app\models\User;
use app\models\UserSearch;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\filters\VerbFilter;
use yii\filters\AccessControl;
use app\models\Sales;
use yii\data\ActiveDataProvider;

 class UserController extends Controller
{
/**
 * {@inheritdoc}
 */
 public function behaviors()
 {
    return [
        'access' => [
            'class' => AccessControl::className(),
            'rules' => [
                [
                    'allow' => true,
                    'roles' => ['?'],
                ],
            ],
        ],
        'verbs' => [
            'class' => VerbFilter::className(),
            'actions' => [
                'delete' => ['POST'],
            ],
        ],
    ];
}

public function actionCreate()
{
    $model = new User();
   $hash = Yii::$app->getSecurity()->generatePasswordHash('qwerty123456');

    if ($model->load(Yii::$app->request->post())) {
        $post = Yii::$app->request->post();
//debug($post);
        $hash = Yii::$app->getSecurity()->generatePasswordHash($post['User']['password']);
        $model->username = $post['User']['username'];
        $model->password = $hash;
        $model->name = $post['User']['name'];
        $model->mail = $post['User']['mail'];
        $model->role = $post['User']['role'];
        $model->crm = $post['User']['crm'];

        $model->save();
        return $this->redirect(['view', 'id' => $model->id]);
    }

    return $this->render('create', [
        'model' => $model,
    ]);
}

protected function findModel($id)
{
    if (($model = User::findOne($id)) !== null) {
        return $model;
    }

    throw new NotFoundHttpException('The requested page does not exist.');
}
}