CodeIgniter : Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2003] - codeigniter

Please help me understand :
Uncaught exception 'PDOException' with message 'SQLSTATE[HY000] [2003] Can't connect to MySQL server on XXXXXXXXX.
Note :
The Application is build on CodeIgniter Framework.
It is able to connect to DB sometimes, as it allows to login which is DB - authenticated.

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