SEN0539-EN Gravity Offline Voice Recognition Crashes Arduino Nano!!!

Hi, I have the below code which I have stripped back to try and fault find so apologies for lots of rem's. I'm using I2C. Basically the dfrobot code uint8_t CMDID = asr.getCMDID(); seems to be the cause of the Nano crashing after about 10 secs of the loop. If I remove all the df CMDID code and switch code it loops no problem 

Listening for CMDID, Switch CMDID, End of loop, Start of loop, DigitalRead, Listening for CMDID

I have tried watchdog and pragma fix but still crashes. Has anyone else had this problem or knows a fix please? Thanks.

#include "DFRobot_DF2301Q.h"

#include <Wire.h>

//#include <LiquidCrystal_I2C.h>

#include <Servo.h>

//LiquidCrystal_I2C lcd(0x27, 16, 2);

// SO WatchDog ================================

//#include <avr/wdt.h>

//int time = 0;

//wdt_enable(WDTO_2S);

// EO WatchDog ================================

// SO Define Servo Variables ==================================================//

Servo myservoA;  // create servo object to control a servo

int posA = 90;  // variable to store the servo position

int homePos = 90;

const int button1Pin = 6;

const int button2Pin = 7;

//const int LED_BUILTIN = 13;

int button1State = 0;  // variable for reading the pushbutton status

int button2State = 0;

int x = 0;

int y = 0;

// EO Define Servo Variables ==================================================//

//I2C communication

DFRobot_DF2301Q_I2C asr;

int vol = 5;

void setup() {

  Wire.begin();

  Serial.begin(115200);

  pinMode(LED_BUILTIN, OUTPUT);

  pinMode(button1Pin, INPUT);

  pinMode(button2Pin, INPUT);

  myservoA.attach(5);  //attaches the servo on pin 5

  //wdt_disable();

  //Wire.setClock(100000);

   while (!Serial) {

    ;  // wait for serial port to connect. Needed for native USB port only

  }

  delay(20);

  Serial.println("Serial Ready");

  Serial.println("Nano booting up!!!");

  digitalWrite(LED_BUILTIN, HIGH);

  posA = 80;

  myservoA.write(posA);

  Serial.println("Running SetUp");

  Serial.print("Set servo at ");

  Serial.println(posA);

  delay(2000);

  posA = 100;

  myservoA.write(posA);

  Serial.print ("Set servo at ");

  Serial.println(posA);

  delay(2000);

  myservoA.write(homePos);

  Serial.print("Setup complete servo at pos ");

  Serial.println(homePos);

  delay(1000);

  // Init the sensor

  Serial.println("Looking for DfRobot");

  while (!(asr.begin())) {

  Serial.println("Communication with device failed, please check connection");

  digitalWrite(LED_BUILTIN, HIGH);

  delay(3000);

 }

  digitalWrite(LED_BUILTIN, LOW);

  Serial.println("Found DfRobot");

  /**

   * @brief Set voice volume

   * @param voc - Volume value(1~7)

   */

  asr.setVolume(vol);

  /**

     @brief Set mute mode

     @param mode - Mute mode; set value 1: mute, 0: unmute

  */

  //asr.setMuteMode(0);

  /**

     @brief Set wake-up duration

     @param wakeTime - Wake-up duration (0-255)

  */

  asr.setWakeTime(40);

  /**

     @brief Get wake-up duration

     @return The currently-set wake-up period

  */

  //uint8_t wakeTime = 0;

  //wakeTime = asr.getWakeTime();

  //Serial.print("wakeTime = ");

  //Serial.println(wakeTime);

  /**

     @brief Play the corresponding reply audio according to the ID

     @param CMDID - command word ID

  */

 // asr.playByCMDID(5);  // Command word ID

  delay(2000);

  Serial.println("Mercedes Ready! vr2");

}

// wake word = 2 custom words id 5 - 21

// command id's https://wiki.dfrobot.com/SKU_SEN0539-EN_Gravity_Voice_Recognition_Module_I2C_UART#target_9

void loop() {

  digitalWrite(LED_BUILTIN, LOW);

  delay(20);

  Serial.println("Start of loop");

 /**if(millis()/1000 > 15) {

     Serial.println("Forced Reboot");

    wdt_enable(WDTO_15MS);  

   }

*/

  button1State = digitalRead(button1Pin);  // read the state of the pushbutton

  button2State = digitalRead(button2Pin);

  Serial.println("DigitalRead");

  /**

     @brief Get the ID corresponding to the command word

     @return Return the obtained command word ID, returning 0 means no valid ID is obtained

  */

  Serial.println("Listening for CMDID");

/**

     @brief Get the ID corresponding to the command word

     @return Return the obtained command word ID, returning 0 means no valid ID is obtained

  */

  uint8_t CMDID = asr.getCMDID();

  Serial.println("Switch CMDID");

  switch (CMDID) {

    case 103:                                                  //If the command is “Turn on the light”

     // digitalWrite(Led, HIGH);                                 //Turn on the LED

      Serial.println("received'Turn on the light',command flag'103'");  //Serial transmits "received"Turn on the light",command flag"103

      break;

    case 104:                                                  //If the command is “Turn off the light”

      //digitalWrite(Led, LOW);                                  //Turn off the LED

      Serial.println("received'Turn off the light',command flag'104'");  //The serial transmits "received"Turn off the light",command flag"104""

      break;

    default:

      if (CMDID != 0) {

        Serial.print("CMDID = ");  //Printing command ID

        Serial.println(CMDID);

      }

  }

  delay(300);

}