A root-cause analysis for this issue has been performed and is now available at https://cdn.auth0.com/blog/20210920-incident-RCA.pdf
We saw a series of short (1-3 minute) service degradations at approximately 15:40, 16:40, and 16:48. We identified the cause and took actions to mitigate it. An RCA will be posted within 14 days.
We are currently investigating this issue.