Although I don’t know anything about the internals of the Patreon service, according to this forum there are no limits (as of December) and if you were rate-limited then you would have received an email about it:
If we ever see naughty clients via our logging, we will email the author and in extreme circumstances, will disable the client or the oauth token that is being used to create those requests, but those are extremely rare and most of our clients have been acting in a sane and responsible manner.
The problem could lie in many different places, without the ability to debug it’ll be very difficult to track down the problem, fortunately there are options to debug in production: add logging for Patreon API responses, then you can mock the Patreon service in your development environment with that response and see how your code functions.
Are you using one of the Patreon libraries or have you written your own code to interface with the Patreon API? If you need help setting up logging with one of the libraries please share which you’re using.