@Adolfo_Cobo I see. That is a strange issue and not at all what I have seen. You could try following my instructions for serial communications in previous posts. Other than that I have no clue what could be happening with your setup. I have had very good results with the serial driver. I found the i2c driver very unreliable. Good luck! Hope all goes well. If you decide to go with serial comms, feel free to reach out if you need any assistance.
-James