Lot of DATABASE ERROR: CONNECTION FAILED!

[Borszczuk]

I got tons of

DATABASE ERROR: CONNECTION FAILED!

Unable to connect to the database!
Please contact your server-administrator.

errors. Checked logs/errors and see lot of:

[15-Mar-2010 23:33:20 +0100]: DB Error: MDB2 Error: unknown error Query: _doQuery: [Error message: Could not execute statement] [Last executed query: EXECUTE mdb2_statement_mysql_1cf1b06230a49f6b66fdf5195fba02171cd1b2ab9 USING @0] [Native code: 1615] [Native message: Prepared statement needs to be re-prepared
]  in /program/include/rcube_mdb2.php on line 627 (GET /)

Any hints?