Modem Only Turns On With Reset Button

[t-az]

Hello. I am having an issue where the SIM7000G will only power on if I push the reset button on the board to reboot the ESP32. If I unplug the USB and plug it back in, the SIM7000G never powers on. Any help would be appreciated. Thanks

Pin definitions and power functions

#define UART_BAUD           115200
#define PIN_DTR             25
#define PIN_TX              27
#define PIN_RX              26
#define PWR_PIN             4
#define LOCK_PIN            0
#define UNLOCK_PIN          36
#define REMOTESTART_PIN     39

void modemPowerOn(){
  pinMode(PWR_PIN, OUTPUT);
  digitalWrite(PWR_PIN, LOW);
  delay(1080);
  digitalWrite(PWR_PIN, HIGH);
}

void modemPowerOff(){
  pinMode(PWR_PIN, OUTPUT);
  digitalWrite(PWR_PIN, LOW);
  delay(1500);
  digitalWrite(PWR_PIN, HIGH);
}

void modemRestart(){
  modemPowerOff();
  delay(1000);
  modemPowerOn();
}

Setup function

void setup() {

  //Configure output pins
  pinMode(LOCK_PIN, OUTPUT);
  digitalWrite(LOCK_PIN, LOW);
  pinMode(UNLOCK_PIN, OUTPUT);
  digitalWrite(UNLOCK_PIN, LOW);
  pinMode(REMOTESTART_PIN, OUTPUT);
  digitalWrite(REMOTESTART_PIN, LOW);

  delay(1000);

  modemRestart();

  delay(6000);

  // Set GSM module baud rate
  //TinyGsmAutoBaud(SerialAT, GSM_AUTOBAUD_MIN, GSM_AUTOBAUD_MAX);
  SerialAT.begin(115200, SERIAL_8N1, PIN_RX, PIN_TX);

  delay(2000);

#if TINY_GSM_USE_GPRS
  // Unlock your SIM card with a PIN if needed
  if (GSM_PIN && modem.getSimStatus() != 3) { modem.simUnlock(GSM_PIN); }
#endif

if (!modem.waitForNetwork(600000L, true)) {
    delay(10000);
    return;
}

delay(3000);

#if TINY_GSM_USE_GPRS
  // GPRS connection parameters are usually set after network registration
  modem.gprsConnect(apn, gprsUser, gprsPass);
  if (!modem.isGprsConnected()) {
    delay(10000);
    return;
  }
#endif

  // MQTT Broker setup
  mqtt.setServer(broker, 8883);
  mqtt.setCallback(mqttCallback);
}