ThingSpeak

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I'm using the ThingSpeak library that I had downloaded from github on 10/27/20. I'm sending data to ThingSpeak just over every 15 seconds. The data will send without issue a couple of times and will return a value of 200, and then the next time will return a value of -301. I've incorporated a while loop to immediately send the data again when encountering this, and it always goes through successfully the second time. The only issue is that when I'm getting the -301 error it's pausing the program for about 10 seconds. When researching this issue, I was finding examples where the user was unable to send data at all, I wasn't really seeing examples of intermittent issues like mine. Any thoughts on what the issue could be? #include "ThingSpeak.h" #include <ESP8266WiFi.h> //------- WI-FI details ----------// char ssid[] = "xxxxxxxxx"; //SSID here char pass[] = "xxxxxxxxx"; // Passowrd here //-----------------------------// //----------- Channel details ----------------// unsigned long Channel_ID = xxxxxxxxx; // Your Channel ID const char * myWriteAPIKey = "xxxxxxxxxx"; //Your write API key //-------------------------------------------// #define SENSOR 2 const int Field_Number_1 = 1; int sensorVal = 0; unsigned long timeNow = 0; unsigned long timerStart = 0; unsigned long timerStart2 = 0; unsigned long instance = 0; int writeSuccess = 0; WiFiClient client; void setup() { // put your setup code here, to run once: Serial.begin(115200); WiFi.mode(WIFI_STA); ThingSpeak.begin(client); pinMode(SENSOR, INPUT); internet(); } void loop() { // put your main code here, to run repeatedly: timeNow = millis(); internet(); if (timeNow - timerStart > 2000) {} sensorVal = digitalRead(SENSOR); Serial.println(sensorVal); timerStart = millis(); } upload(); } void internet() { if (WiFi.status() != WL_CONNECTED) { while (WiFi.status() != WL_CONNECTED) { WiFi.begin(ssid, pass); delay(5000); } } } void upload() { if (timeNow - timerStart2 > 15100) { ThingSpeak.setField(1,(String)sensorVal); ThingSpeak.setField(2,(String)instance); writeSuccess = ThingSpeak.writeFields(Channel_ID, myWriteAPIKey); Serial.print("Write success: "); Serial.println(writeSuccess); while (writeSuccess == -301) { writeSuccess = ThingSpeak.writeFields(Channel_ID, myWriteAPIKey); Serial.print("Write success: "); Serial.println(writeSuccess); } timerStart2 = millis(); instance++; } }