Gemini API 503 status: "UNAVAILABLE"

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I constantly get 503 status: “Unavailable“ on model Gemini-2.5-Flash. Therefore, my app cannot function, because of this error. I tried pretty much frequently throught out the day, and the last 2 days it always fails to work, and returns 503 error. I would understand it can happen on the free tier, but on the paid tiers it cannot be happening this frequently.

Same goes in the Antigravity IDE, when I need models my requests keep being denied, because of the servers overload, everytime after 9 PM EST. There I am also using a paid tier, I believe it is a Pro plan.

Is there a way to solve this issue?

I was initially on the flash 2.0 when i was getting this error , i switched to 2.5 flash and dont know why but it fixed and started working. Right now i am doing basic R&D on the root cause.