Blynk 2.0 goes offline after 2 to 3day

Dear Blynk Team
i am not new on Blynk but yes i am new in Blynk 2.0 i have using Blynk Legency no issue it will work perfect more than 1year.ago now i am planing to shifting Blynk 2.0 but i have issue Blynk 2.0 after 2 and 3days always goes offline i need to reset the device then it will come back to online
and at the same place i keep two esp32 for testing 1is Blynk Legency other one is Blynk 2.0 blynk Legency is no problem at all time it will working perfect blynk 2.0 having issue after 2 & 3 days goes ofline
can anyone give me solution please i appreciate it
i hope you Hear me soon

Best Regards
Maaz

// Fill-in information from your Blynk Template here
#define BLYNK_TEMPLATE_ID "TMPLEXxvKAa_"
#define BLYNK_DEVICE_NAME "maaz"

#define BLYNK_FIRMWARE_VERSION        "0.1.0"

#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG

#define APP_DEBUG

// Uncomment your board, or configure a custom board in Settings.h
//#define USE_WROVER_BOARD

#include "BlynkEdgent.h"
int botton = 6;
BLYNK_WRITE(V0){
  int pinValue = param.asInt();
  Serial.println(pinValue); 
}
void setup()
{ pinMode(botton, OUTPUT);
  Serial.begin(115200);
  delay(100);

  BlynkEdgent.begin();
}

void loop() {
  BlynkEdgent.run();
}