Already it resolved, in the end it was my mistake .
had the power connected to the distributor of the lipho battery which has voltage variations (3,4 - 3,9V)
When I connected the VCC and GND to the power outputs of the Arduino mini pro , it works perfectly .
Thank you very much for the help.
By the way, that way I can stabilize the energy that comes from the battery to the dealer to be constant?
With a capacitor?