Google Cloud SQL 5.7 – Database disappearing

In CloudSQL Mysql 5.7 instance which has nearly 30 DB in it. recently we are finding a rare issue that clears all the Table in the DB and make it as an empty DB. Every week one of the DB gets empty. Previously we had in MySql 5.6(Google Cloud) and didn’t face this problem for last two years. but last 1 month we faced this more than 3 times 🙁 

it throws the error :

    14:57:53 Error loading schema content Error Code: 1049 Unknown database ‘wp-map’

Though DB name is visible when trying to use it is not allowing.