Error: Socket hang up inside google cloud (nodejs) function

I'm using a google cloud function to get an token from Firestore, check if it is still active, if so return access token. Else:

1. Get refresh token from secretmanager
2. Refresh
3. Update refresh token in secret manager
4. Update access token in firebase

Now i get this error sometimes... This function is minimally called every 15 minutes from an different cloud function. The error occurs like 5 times a day. I've seen this post but can't wrap my head around to get this translated to my code.

Error:

FetchError: request to https://europe-west1-project.cloudfunctions.net/getToken failed, reason: socket hang up
        at ClientRequest.<anonymous> (/workspace/node_modules/node-fetch/lib/index.js:1461:11)
        at ClientRequest.emit (events.js:315:20)
        at ClientRequest.EventEmitter.emit (domain.js:467:12)
        at TLSSocket.socketOnEnd (_http_client.js:493:9)
        at TLSSocket.emit (events.js:327:22)
        at TLSSocket.EventEmitter.emit (domain.js:529:15)
        at endReadableNT (internal/streams/readable.js:1327:12)
        at processTicksAndRejections (internal/process/task_queues.js:80:21) 

Code:

const { SecretManagerServiceClient } = require("@google-cloud/secret-manager");
const client = new SecretManagerServiceClient();
const name = `projects/${process.env["PROJECT"]}/secrets/TOKEN/versions/latest`;

const axios = require("axios");
const milliseconds = new Date().getTime()
const now = Math.round(milliseconds / 1000);

const { Firestore } = require("@google-cloud/firestore");
const firestore = new Firestore();
const tokens = firestore.collection("tokens");

module.exports = async function getToken() {
  let responseData;

  await tokens.where("system", "==", "x").limit(1).get()
    .then((res) => {
      res.forEach((snap) => {
        responseData = snap.data();
      });
    })
    .catch((err) => {
      console.error(JSON.stringify(err));
    });
  
  console.log(`custom_log: now = ${now}`)
  console.log(JSON.stringify(responseData))
  
  if (now - responseData.timestamp < 250) {
    console.log(`custom_log: Returning access token from Firebase`)
    return responseData.access_token;
  } else {
    console.log(`custom_log: Return new access token`)
    return await refreshToken();
  }
};

async function refreshToken() {
  const [version] = await client.accessSecretVersion({ name: name });
  const secret = version.payload.data.toString();

  const config = {
    method: "post",
    url: "https://login.webpage.com/token?grant_type=client_credentials",
    headers: {
      Authorization: `Basic ${secret}`,
    },
  };
  return axios(config)
    .then((response) => {
      updateAccesToken(response.data.access_token)
      return response.data.access_token;
    })
    .catch((error) => {
      console.error(`custom_error: Error refresh token: ${error.message}`);
    });
}

async function updateAccesToken(token) {
  await tokens.doc('token').update({
    timestamp: now,
    access_token: token,
    dateTime: new Date(milliseconds).toISOString()
  })
  console.log('custom_log: access_token updated in Firestore')
}