DHT22 need pull down/up ESP8266 I have the strange pb.
My esp8266 was working fine with my DHT22 and then failed every time.
I loaded an example sketch in a other ESP8266 and I have the same pb.... until I shut down -> up the DHT22 when the ESP8266 is working.
To check more, I added this at the setup before dht.begin() :

      digitalWrite(0, LOW); // turn the LED on (HIGH is the voltage level)
  delay(1000); // wait for a second
  digitalWrite(0, HIGH);


And it works. But I don't know why I need to do this "pull up".
PS : I already tried with or without the 10K resistor, same pb.
PS2 : I already tried with 3.3v or 5V for DHT22. Same pb.

Any idea ?
I answer my own question in case someone has the same issue.
The ADAFRUIT_DHT lib DOESN'T WORK WITH ESP8266. It keep saying Failed to read from DHT sensor! until you unplug/plug the VCC on the DHT.

But the DHTesp (link) works very well at first try !

Thx @Juraj and @Jot for their support.