Confused about HubSpot API rate limits and inconsistent responses

I am a bit stuck and honestly confused here. I am working on a small integration using HubSpot APIs, and while things work initially, I keep running into inconsistent behavior with API responses and rate limits. Sometimes the same request works fine, and other times it fails without any clear change on my side. I’ve double-checked authentication, scopes, and request formatting, but it still feels unpredictable. At this point, I’m not sure if I’m misunderstanding HubSpot’s rate limiting, if there’s some best practice I’m missing, or if this is just expected behavior under certain conditions. Has anyone else run into something similar or figured out a reliable way to handle this?