Hi Gustavo,
My apologies for the delayed response. You're using the AdWords API, which is perfectly fine, I was just curious for reference.
Based on the logs you shared it appears as though something is changing in the OAuth client, which is managed via the developer console
here, I'm guessing that's the site you've been logging into to re-create this client when it gets deleted, is that right?
Do you know if another process or individual has access to the client and may be deleting it unknowingly? If not, and if you think it's an error with the developer console, you should reach out to their support team as those clients are totally separate from our API and we don't have access to those resources here. You can contact support by clicking on the main menu button in the top-left corner of the screen and selecting "Support"
Hope that helps.