Arduino Leonardo USB HID keyboard doesn't work

[butachank]

Hello, I need help on a recurrent bug.
I try to emulate WASD with a joystick connected to Arduino leonardo board.
Sometimes, when I reinstall Arduino IDE, Keyboard library functions work, and when I upload it several times (for improvement), these keyboard functions stop working while everything else keep working.

First time it disfunctionned, I reinstalled Arduino Uno and restarted windows 10, and magically the same program worked again. Then I uploaded a program for 2 joysticks and the simple joystick program messed again: no keyboard function.
And reinstalling Arduino IDE didn't change anything

Second time, it magically worked again, I had to restart windows 10 for update, uninstall Arduino IDE, restart Windows 10 again, install Arduino IDE.
And after upload the same program, keyboard function stop working again.

I am pretty sure the problem doesn't come from the hardware, my board is leonardo but not an original from Arduino.

I am also pretty sure the problem is not my code :

#include<Keyboard.h>

// Analog input of the horizontal joystick position
const int JoystickX = A0;
// Analog input of the vertical joystick position
const int JoystickY = A1;
//joystick press
const int SW_pin = 2;

void setup()
{
  Serial.begin(9600);
  pinMode(SW_pin, INPUT_PULLUP);
}

void loop()
{
  // Process horizontal joystick position
  int x = analogRead(JoystickX);
  if (1023 == x)
  {
    Keyboard.press('d');
    Serial.print("eaezae");
  }
  else if (0 == x)
  {
    Keyboard.press('a');
    Serial.print("eaezae");
  }
  else
  {
    Keyboard.release('d');
    Keyboard.release('a');
    delay(5);
  }

  // Process vertical joystick position
  int y = analogRead(JoystickY);
  if (0 == y)
  {
    Keyboard.press('w');
    Serial.print("eaezae");
  }
  else if (1023 == y)
  {
    Keyboard.press('s');
    Serial.print("eaezae");
  }
  else
  {
      Keyboard.release('w');
    Keyboard.release('s');
    delay(5);
  }
  int z = digitalRead(SW_pin);
  Serial.print(z);

  if(0==z)
  {
  Keyboard.press('e');  
  }
  else
  {
    Keyboard.release('e');
  }
}

I already tried to upload this program and the connect the arduino board at the exact moment linking everything together was displayed in the console but didn't work.
I also tried to change the port & com number in peripheral device but didn't work either

I am running out of idea

[sterretje]

You are missing a Keyboard.begin(). Have a look at the examples.

[butachank]

this program works without keyboard.begin()

Already added it and it doesn't change anything

[runaway_pancake]

Get it down to confirming Keyboard operation - make a sketch where it's only typing an 'X', delay(n), 'X', . . .
Have it delay long enough to make Notepad the active window and see it happen there.