Gemini-2.0-Flash Response is returning "429" even with peak usage to be less than 1%

Hi team,
In recent one week, we’ve been seeing this issue happening multiple times when calling methond google.ai.generativelanguage.v1beta.GenerativeService.StreamGenerateContent. Can you pls check why we’re getting this 429 issue related to model Gemini-2.0-flash-lite?

We’re seeing Error with message in prod 429 RESOURCE_EXHAUSTED. {'error': ('code': 429, 'message': 'Resource has been exhausted (e.g. check quota)', 'status': 'RESOURCE_EXHAUSTED'
When running code:

 response = genai_client.models.generate_content_stream(
                model=model,
                contents=history,
                config=config,
            )
            return 
  self._handle_generate_stream_response(model, credentials, response, prompt_messages)

It’s affecting our prod env but I checked from “API/Service Details” the usage at peak is < 1%. It makes no sense.