We are currently experiencing a regression on the Insights API (https://developers.facebook.com/docs/marketing-api/insights/) leading to increased latency and error responses.
Our teams are currently working on platform improvements that are estimated to launch by the end of the month. Until then, you may experience increased latency and error responses. We recommend... retrying your queries with a delay to increase the amount of time the Insights API has to respond. We apologize for any inconvenience this may have caused and appreciate your understanding and patience during this time.