An Azure service that provides an event-driven serverless compute platform.
Thanks for reaching out to Q&A.
I would suggest you to look into the function invocation logs and the application insights end to end transaction logs to get more details about this intermittent issue. You can also look into the diagnose and solve problems blade in the Function portal and run the "Function app down or reporting errors" detector to see if there are any issues related to platform during the time the issue was seen.
Please let me know if you have any queries.