CORS policy crashing after 1-2 days

In The Loop
1

Yo yo, I built a simple API and hosted it on a free plan.
The service works fine for 1-2 days but after a while, it will ‘crash’ and it will start showing the CORS header policy and the requests will not be sent.
Here is my API code that sets up the cors policy:

const express = require('express')
const helmet = require('helmet')
const cors = require('cors')
const morgan = require('morgan')

const app = express()

app.set('trust proxy', 'loopback')

if (process.env.ENVIRONMENT !== 'test') {
  // logger
  app.use(
    morgan(
      '[:date[clf]] ":method :url HTTP/:http-version" :status :res[content-length]'
    )
  )
}

// helmet configurations
app.use(helmet())

app.use(helmet.referrerPolicy())

app.use(
  helmet.contentSecurityPolicy({
    directives: {
      defaultSrc: ["'self'"]
    }
  })
)

app.use(
  helmet.featurePolicy({
    features: {
      fullscreen: ["'self'"],
      vibrate: ["'none'"],
      syncXhr: ["'none'"]
    }
  })
)

// cors
app.use(cors({
  origin: '//origin link', 
  methods: 'GET,HEAD,PUT,PATCH,POST,DELETE',
  preflightContinue: false,
  optionsSuccessStatus: 204,
  credentials: true
}));


app.use(express.json())

const api = require('./src/api')

app.use(api)

module.exports = app

Why is this happening? I get that it happens right away but after 1-2 days?? Makes no sense.

Also, this is the CORS error that appears:
Access to fetch at X from origin Y has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource…