Problem with multiple database phalcon version 1.2.4

Ok, this is the situation

• 1 server on address 10.10.1.4, with database db1 (master server)
• 1 server on address 10.10.1.5, with database db1 (slave server)
• 1 server on address 10.10.1.6 with database db2 (master server)
• 1 server on address 10.10.1.6 with database db2 (slave server)

Ok, the conection at the database it's fine and working, but if i have:

$user1 = new models\db1\Usuario();
$userMaster = $user->find('username = 'asdf'');
$user2 = new models\db2\Usuario();
$userSlave = $user->find('login = 'asdf'');

I got the following error:

Se ha capturado un error. exception 'PDOException' with message 'SQLSTATE[42S02]: Base table or view not found: 1146 Table 'db1.master_user' doesn't exist' in /var/www/pil/app/library/Autenticador.php:125

Ok, my Usuario class:

--models/db1/Usuario.php

namespace models\db1

class Usuario extends \Phalcon\Mvc\Model{
    public function initialize(){
        $this->setReadConnectionService('slaveAdapter_db1');
        $this->setWriteConnectionService('masterAdapter_db1');
        $this->setSource('usuario');
    }
}

--- models/db2/Usuario.php

namespace models\db2

class Usuario extends \Phalcon\Mvc\Model{
    public function initialize(){
        $this->setReadConnectionService('slaveAdapter_db2');
        $this->setWriteConnectionService('masterAdapter_db2');
        $this->setSource('master_user');
    }
}

I do the following, thinking if the variables can't coexist in the same code block

class HiperClass
{
public function f1(){
   $user = new models\db1\Usuario();
   $user1 = $user->find('username = "asdf"');
}

public function f2(){
   $user = new models\db2\Usuario();
   $user2 = $user->find('login = 'asdf'');
}

public function f3(){
    $this->f1();
    $this->f2();
}

But it's the same problem, maybe it's for the conection isn't close, but my ideas it's running low.

Please anyone can help me.

thx

ps: sorry for my bad english, i hope that understood.