I have a custom board with DA14580. The board has one clock 16Mhz. SDK si 3.06. After a connection established I am trying to use a GPIO to power an external opam amplifier and run the adc to read the analog signal. It works in active mode but stops working if I enable any sleep mode. Even if I try to control the mode from the app, let say deep sleep in advertisement and force active after connection, the gpio is not controlled. Any suggestions?