Device detected but soft WDT reset

Using SIM800L and ESP8266

#define TINY_GSM_MODEM_SIM800

#include <SoftwareSerial.h>
#include <TinyGsmClient.h>
#include <Arduino.h>

// Pin assignments for NodeMCU
const int RX_PIN = D5;
const int TX_PIN = D6;

SoftwareSerial SerialAT(RX_PIN, TX_PIN); // RX, TX

// Network details
const char apn[]  = "airtelgprs.com";
const char user[] = "";
const char pass[] = "";

TinyGsm modem(SerialAT);
TinyGsmClient client(modem);

unsigned long previousMillis = 0;
const long interval = 5000;  // Interval in milliseconds (5 seconds)

void setup() {
  Serial.begin(9600);
  SerialAT.begin(9600); 

  delay(2000);
  Serial.println("System start.");
  modem.restart();

  Serial.println("Modem: " + modem.getModemInfo());

  Serial.println("Searching for telco provider.");
  if(!modem.waitForNetwork()) {
    Serial.println("fail");
    while(true);
  }
  Serial.println("Connected to telco.");
  Serial.println("Signal Quality: " + String(modem.getSignalQuality()));
}


01:21:11.577 -> ��,System start.
01:21:19.928 -> Modem: SIM800 R14.18
01:21:19.928 -> Searching for telco provider.
01:22:21.145 -> fail
01:22:23.674 -> 
01:22:23.674 -> --------------- CUT HERE FOR EXCEPTION DECODER ---------------
01:22:23.738 -> 
01:22:23.738 -> Soft WDT reset
01:22:23.738 -> 
01:22:23.738 -> >>>stack>>>
01:22:23.769 -> 
01:22:23.769 -> ctx: cont
01:22:23.769 -> sp: 3ffffdb0 end: 3fffffd0 offset: 01a0
01:22:23.835 -> 3fffff50:  00000000 00000004 3ffee9ac 40204078  
01:22:23.900 -> 3fffff60:  00000000 3ffee9ac 3ffee8e4 40202198  
01:22:23.934 -> 3fffff70:  00000000 00000000 feefeffe feefeffe  
01:22:23.999 -> 3fffff80:  00000000 0014004f 00000000 feefeffe  
01:22:24.033 -> 3fffff90:  00000000 0014004f 00000000 feefeffe  
01:22:24.098 -> 3fffffa0:  feefeffe feefeffe feefeffe 3ffeea40  
01:22:24.164 -> 3fffffb0:  3fffdad0 00000000 3ffeea14 40205324  
01:22:24.196 -> 3fffffc0:  feefeffe feefeffe 3fffdab0 40101401  
01:22:24.260 -> <<<stack<<<
01:22:24.260 -> 
01:22:24.260 -> --------------- CUT HERE FOR EXCEPTION DECODER ---------------

vshymanskyy / TinyGSM

Device detected but soft WDT reset #789