OAuth2 expired always after a couple of hours

Question

I am trying to build some code to do some processing in youtube channel, it required that I generate OAuth2 client id and secret and I created them and it works but after a couple of hours I start getting this error

A service error occurred: { "error": { "code": 401, "message": "Request had invalid authentication credentials. Expected OAuth 2 access token, login cookie or other valid authentication credential. See https://developers.google.com/identity/sign-in/web/devconsole-project.", "errors": [ { "message": "Invalid Credentials", "domain": "global", "reason": "authError", "location": "Authorization", "locationType": "header" } ], "status": "UNAUTHENTICATED" } }

I solved it by removing the app from third-party connected apps and signing out from the account and logging in again, then I get the Authorize app steps and its return to work again, but it happen again

I do not know why the credentials expire and if there is any way to make them always valid and solve this problem permanently