带有firebase的ESP8266异常 (9) 随机重置是怎么回事？

嗨，
我是 ESP8266 的新手。我正在尝试使用 thunkable 和 nodemcu 制作家庭自动化系统。我需要使用 nodemcu 从 firebase 节点获取数据——这将由 thunkable 制作的应用程序更新。我遇到了一个问题——在使用 nodemcu 从 firebase 获取数据时，在一定时间（大约 60 秒）后，电路板因异常（9）而被重置。
我的代码：
代码：全选long int T1, T2, T3, T4, T5;
int T1_on, T2_on, T3_on, T4_on, T5_on;

void setup() {
  Serial.begin(115200);

  // connect to wifi.
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD); Serial.print(\"connecting\");
  while (WiFi.status() != WL_CONNECTED) { Serial.println(\".\") ;
  delay(300);
  }
  Serial.println(); Serial.print(\"connected: \"); Serial.println(WiFi.localIP());

  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);

  //firebase tree for WBXSS00001
  Firebase.setString(\"WBXSS00001/EMAIL\", \"x\");
  Firebase.setInt(\"WBXSS00001/OnStat\", 0);
  Firebase.setInt(\"WBXSS00001/PIN\", 1234);
  Firebase.setString(\"WBXSS00001/QR\", \"WBXSS00001A\");
  Firebase.setInt(\"WBXSS00001/T_1\", 0);
  Firebase.setInt(\"WBXSS00001/T_2\", 0);
  Firebase.setInt(\"WBXSS00001/T_3\", 0);
  Firebase.setInt(\"WBXSS00001/T_4\", 0);
  Firebase.setInt(\"WBXSS00001/T_5\", 0);
}

void loop() {

  //get Timer_1,2,3,4,5 input from fbase and isolate it

  if (Firebase.getInt(\"WBXSS00001/T_1\") != 0)  {  T1 = Firebase.getInt(\"WBXSS00001/T_1\");  T1_on == 1;  }  
else if (Firebase.getInt(\"WBXSS00001/T_1\") == 0) { T1_on == 0; }

  Serial.println(millis());

}

这个想法是每当 WBXSS00001/T_1 更改其值时，都会保存到 T1。
现在，在 50 到 60 秒后，电路板会通过以下消息自行重置：
代码：全选Exception (9):
epc1=0x4020c850 epc2=0x00000000 epc3=0x00000000 excvaddr=0x463a336b depc=0x00000000

>>>stack>>>

ctx: cont
sp: 3ffffc70 end: 3fffffc0 offset: 0190
3ffffe00:  00000000 00000000 3ffffec8 3ffeea28  
3ffffe10:  0000000b 3ffee9f0 3fff04c8 40206354  
3ffffe20:  00000000 000001bb 3fff04c8 402077f0  
3ffffe30:  3ffe8890 0000003b 3fff04c8 40207d0e  
3ffffe40:  0000003b 3ffee9f0 0000002e 40203974  
3ffffe50:  3ffffe98 0000003b 3ffffe80 402087a4  
3ffffe60:  3ffee9ec 3ffffe80 3ffe8890 3fff0244  
3ffffe70:  3ffee9ec 3ffffec8 3fff04c8 402056da  
3ffffe80:  3fff07ac 003b003f 00fffec8 3fff0754  
3ffffe90:  0042004f 00ff0870 3fff055c 0028002f  
3ffffea0:  00feec04 00000010 3fff0342 3fff0244  
3ffffeb0:  3ffee9ec 3ffe880d 3fff0244 40202e96  
3ffffec0:  3fffdad0 00000000 3fff0858 3fff0244  
3ffffed0:  3fffff00 3fffff00 3ffe8826 40203938  
3ffffee0:  3fffff08 00000000 3fff0334 3fff0244  
3ffffef0:  3ffee9ec 3ffee9f0 3ffee9e8 4020441a  
3fffff00:  3ffeea28 3fff0290 3fffff90 4020866e  
3fffff10:  3fffff90 00000000 3fffff40 402085e0  
3fffff20:  0000000b 0000027e 0000027e 3ffeeb78  
3fffff30:  00000000 3ffe86bc 3ffee9e8 40204485  
3fffff40:  3ffe86bc 0000000e 3fffff90 4020875b  
3fffff50:  0000000e 00000001 3fffff40 40208000  
3fffff60:  007a1200 0000000e 3fffff90 402087a4  
3fffff70:  00000000 3fffff90 3ffe86bc 402087da  
3fffff80:  00000000 3ffe86bc 3ffee9e8 40201088  
3fffff90:  3fff0334 000e000f 00feeb38 4010019d  
3fffffa0:  3fffdad0 00000000 3ffeeb38 40209738  
3fffffb0:  feefeffe feefeffe 3ffe8580 40100cb9  
<<::basic_string(char const*, std::allocator  const&) at c:\\users\\soumyak\\appdata\\local\\arduino15\\packages\\esp8266\\tools\\xtensa-lx106-elf-gcc\\2.5.0-4-b40a506\\xtensa-lx106-elf\\include\\c++\\4.8.2\\bits/basic_string.tcc line 218
0x4020441a: FirebaseArduino::getRequest(String const&) at C:\\ARDUINO_INSTALLED\\Arduino\\libraries\\firebase-arduino-master\\src\\FirebaseArduino.cpp line 101
0x4020866e: String::changeBuffer(unsigned int) at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\WString.cpp line 187
0x402085e0: String::~String() at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\WString.cpp line 125
0x40204485: FirebaseArduino::getInt(String const&) at C:\\ARDUINO_INSTALLED\\Arduino\\libraries\\firebase-arduino-master\\src\\FirebaseArduino.cpp line 115
0x4020875b: String::reserve(unsigned int) at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\WString.cpp line 146
0x40208000: IPAddress::fromString(char const*) at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\IPAddress.cpp line 68
0x402087a4: String::copy(char const*, unsigned int) at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\WString.cpp line 214
0x402087da: String::String(char const*) at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\WString.cpp line 36
0x40201088: loop() at C:\\Users\\Soumyak\\Desktop\\HA-01\\HA-01_code_trial\\HA-01_fbase_test/HA-01_fbase_test.ino line 46
0x4010019d: esp_schedule() at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\core_esp8266_main.cpp line 125
0x40209738: loop_wrapper() at C:\\Users\\Soumyak\\AppData\\Local\\Arduino15\\packages\\esp8266\\hardware\\esp8266\\2.7.1\\cores\\esp8266\\core_esp8266_main.cpp line 197

请帮助我理解这个错误以及如何克服它。是我的代码方法有问题，还是其他什么……？
我的电路板设置为工具部分：