Incorrect ADC readings while WiFi enabled

[Gorkde]

Hardware

Hardware: ESP-12F and Wemos D1

Description

When WiFi is transmitting the ADC is reading incorrectly after some time.
ADC grounded reads 0 in the beginning, later it jumps up to 7 on the other module to 50 even.

Settings in IDE

Module: Generic ESP8266 Module
Flash Size: 4MB/1MB
CPU Frequency: 80Mhz
Upload Using: SERIAL

Sketch

include <ESP8266WiFi.h> // ESP8266WiFi.h

char WLANname[] = "_";
char WLANpw[] = "_";

void setup()
{
Serial.begin(115200);

WiFi.begin(WLANname, WLANpw);
Serial.println(" ");

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("\nCONNECTED");

// WiFi.disconnect();

}

void loop()
{
Serial.println(analogRead(0));
delay(100);
}

*** FOR SOME REASON INSERT CODE DOESNT WORK CORRECTLY ***

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[supersjimmie]

Looks like #2070