Hello,
We will need more information with the use of our internal tools to investigate this more thoroughly. For that I will best advise you to file a case with support[1].
This short failure may be caused by intermittent issues with Cloud Networking [2]. You can also use the Cloud Status dashboard [3] in order to track global issues on GCP.
[1] https://cloud.google.com/support/
[2] https://status.cloud.google.com/incident/cloud-networking/21006
[3] https://status.cloud.google.com/