General Error

[Jessica.C]

almost every time I enter the ACP, a General Error appears
General Error
SQL ERROR [ mysql4 ]

Lost connection to MySQL server during query [2013]

SQL

SELECT COUNT(attach_id) AS total_orphan FROM phpbb_attachments WHERE is_orphan = 1 AND filetime < 1293288514

BACKTRACE

FILE: includes/db/mysql.php
LINE: 175
CALL: dbal->sql_error()

FILE: includes/acp/acp_main.php
LINE: 490
CALL: dbal_mysql->sql_query()

FILE: includes/functions_module.php
LINE: 507
CALL: acp_main->main()

FILE: adm/index.php
LINE: 74
CALL: p_master->load_active()


phpBB3 says it's my host's problem........