Around when? If somehow they’re close in time, that means something.
We can also compare to others if any show up (no others after 5 hours).
The OAuth service is currently over quota, try again in a few hours was a 2018 report that seemed well understood, and the spending limit was raised. There was a January 2023 report that seems a mystery, but there were some oddities found that might have been Google-caused. Not sure if yours might be…