Thank you very much. According my current research I cannot disable power safe function which includes wifi sleep. Reason behind is that I´am also using Bluetooth application and BLE + Wifi does not work in disabled power safe mode. According this discussion:
Nevertheless, I activated adc power and longpress for user button for 2seconds. Since then I have not received any false signals and therefore I think I can deal with this and we have solution so far.
Big Thx and greetings!