Rate Limited Error without reaching quota

[bl21812]

Hello, 

I've been making API requests to gemini 1.5 pro from an app, but starting about 2 days ago I've been getting rate limited (error code 429) errors on some of my requests. The actual usage / requests made to gemini hasn't changed much, and I've confirmed that my usage in terms of requests and tokens is well below my quotas (as seen in images below). Could anyone provide any support here?

Thanks,

Brian