Hello Everyone, Every morning I try to open my client system I get the below error.

To solve it, I kill mysqld service in ubuntu and restart it, then everything goes fine. Any suggestion for this problem ?

PDOException in Connector.php line 55: SQLSTATE[HY000] [2002]

in Connector.php line 55 at PDO->__construct('mysql:host=localhost;port=3306;dbname=dbname', 'username', 'password', array('0', '2', '0', false, false)) in Connector.php line 55 at Connector->createConnection('mysql:host=localhost;port=3306;dbname=dbname', array('driver' => 'mysql', 'host' => 'localhost', 'port' => '3306', 'database' => 'dbname', 'username' => 'username', 'password' => 'password', 'charset' => 'utf8', 'collation' => 'utf8_unicode_ci', 'prefix' => '', 'strict' => false, 'engine' => null, 'name' => 'mysql'), array('0', '2', '0', false, false)) in MySqlConnector.php line 24 at MySqlConnector->connect(array('driver' => 'mysql', 'host' => 'localhost', 'port' => '3306', 'database' => 'dbname', 'username' => 'username', 'password' => 'password', 'charset' => 'utf8', 'collation' => 'utf8_unicode_ci', 'prefix' => '', 'strict' => false, 'engine' => null, 'name' => 'mysql')) in ConnectionFactory.php line 61 at ConnectionFactory->Illuminate\Database\Connectors{closure}() at call_user_func(object(Closure)) in Connection.php line 924 at Connection->getPdo() in Connection.php line 792 at Connection->reconnectIfMissingConnection() in Connection.php line 677 at Connection->run('select * from serviceusers where id = ? and remember_token = ? limit 1', array('505', 'cea34Tctk0mHFTqiihiX4b0Pa0X2HYTzH4P6pYy8Vs2kCWW1a7ebuTQjLPPB'), object(Closure)) in Connection.php line 349 at Connection->select('select * from serviceusers where id = ? and remember_token = ? limit 1', array('505', 'cea34Tctk0mHFTqiihiX4b0Pa0X2HYTzH4P6pYy8Vs2kCWW1a7ebuTQjLPPB'), true) in Builder.php line 1610 at Builder->runSelect() in Builder.php line 1596 at Builder->get(array('*')) in Builder.php line 1577 at Builder->first() in DatabaseUserProvider.php line 74 at DatabaseUserProvider->retrieveByToken('505', 'cea34Tctk0mHFTqiihiX4b0Pa0X2HYTzH4P6pYy8Vs2kCWW1a7ebuTQjLPPB') in SessionGuard.php line 186 at SessionGuard->getUserByRecaller('505|cea34Tctk0mHFTqiihiX4b0Pa0X2HYTzH4P6pYy8Vs2kCWW1a7ebuTQjLPPB') in SessionGuard.php line 141 at SessionGuard->user() in GuardHelpers.php line 49 at SessionGuard->check() in GuardHelpers.php line 59 at SessionGuard->guest() in Authenticate.php line 20 at Authenticate->handle(object(Request), object(Closure)) at call_user_func_array(array(object(Authenticate), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32 at Pipeline->Illuminate\Routing{closure}(object(Request)) in ShareErrorsFromSession.php line 49 at ShareErrorsFromSession->handle(object(Request), object(Closure)) at call_user_func_array(array(object(ShareErrorsFromSession), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32 at Pipeline->Illuminate\Routing{closure}(object(Request)) in StartSession.php line 64 at StartSession->handle(object(Request), object(Closure)) at call_user_func_array(array(object(StartSession), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32 at Pipeline->Illuminate\Routing{closure}(object(Request)) in AddQueuedCookiesToResponse.php line 37 at AddQueuedCookiesToResponse->handle(object(Request), object(Closure)) at call_user_func_array(array(object(AddQueuedCookiesToResponse), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32 at Pipeline->Illuminate\Routing{closure}(object(Request)) in EncryptCookies.php line 59 at EncryptCookies->handle(object(Request), object(Closure)) at call_user_func_array(array(object(EncryptCookies), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32 at Pipeline->Illuminate\Routing{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 102 at Pipeline->then(object(Closure)) in Router.php line 726 at Router->runRouteWithinStack(object(Route), object(Request)) in Router.php line 699 at Router->dispatchToRoute(object(Request)) in Router.php line 675 at Router->dispatch(object(Request)) in Kernel.php line 246 at Kernel->Illuminate\Foundation\Http{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 52 at Pipeline->Illuminate\Routing{closure}(object(Request)) in CheckForMaintenanceMode.php line 44 at CheckForMaintenanceMode->handle(object(Request), object(Closure)) at call_user_func_array(array(object(CheckForMaintenanceMode), 'handle'), array(object(Request), object(Closure))) in Pipeline.php line 136 at Pipeline->Illuminate\Pipeline{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 32 at Pipeline->Illuminate\Routing{closure}(object(Request)) at call_user_func(object(Closure), object(Request)) in Pipeline.php line 102 at Pipeline->then(object(Closure)) in Kernel.php line 132 at Kernel->sendRequestThroughRouter(object(Request)) in Kernel.php line 99 at Kernel->handle(object(Request)) in index.php line 53