Hello Claudio,
Thank you for writing in.
We are sorry for any inconvenience caused you.
To find out solution for you, could you please tell us more detail bout your operation?
For example, the power supply, the working environment, wiring and etc.
If you can, we hope you can send us some pictures to show the wiring.
You can send picture to service# droking dot com(please replace # wiht @)
Please don’t worry, we will find solution for you at that time.
Best regards.