Hi, Since this seems to be an issue, I would recommend to raise this issue in the Public Issue Tracker on the Cloud SQL component using the link below
where communication can be set to private, and your project examined thoroughly for specific issues. You will be getting updates regarding the same by starring the issue.
Please note that this discussion group is oriented more towards general opinions, trends, and issues of general nature touching App Engine and Cloud SQL.
https://b.corp.google.com/issues/new?component=187202&template=1162714