I am using M5Paper but M5.shutdown() is not working even the device is disconnected from the USB. The Loop still running and M5Paper still remains On.
How to shutdown M5Paper and wake up again after specific time intervals?

I am using the sample code from M5 Stack [https://docs.m5stack.com/en/api/m5paper/system_api](link url)

#include <M5EPD.h>

M5EPD_Canvas canvas(&M5.EPD);

void setup()
{
M5.begin();
M5.EPD.SetRotation(90);
M5.TP.SetRotation(90);
M5.EPD.Clear(true);
M5.RTC.begin();
canvas.createCanvas(540, 960);
canvas.setTextSize(3);
canvas.drawString("Press PWR Btn for sleep!", 45, 350);
canvas.drawString("after 5 sec wakeup!", 70, 450);
canvas.pushCanvas(0,0,UPDATE_MODE_DU4);
}

void loop()
{
if(M5.BtnP.wasPressed()){
canvas.drawString("I'm going to sleep.zzzZZZ~", 45, 550);
canvas.pushCanvas(0,0,UPDATE_MODE_DU4);
delay(1000);
gpio_hold_en((gpio_num_t) M5EPD_MAIN_PWR_PIN);
gpio_deep_sleep_hold_en();
M5.shutdown(5);
}
M5.update();
delay(100);
}