Database Error Msgs / Alerts

Is anyone able to tell me what this means? Should this concern me? This happens about once every month or so. The last time this happened was on 4/14/08. Am running Dolphin 6.0.0005

Database error in SITE NAME
Mysql error:
Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Debug backtrace:
Array
(
    [1] => Array
        (
            [file] => /home/path/to/site/periodic/tags.php
            [line] => 22
            [args] => Array
                (
                    [0] => /home/path/to/site/inc/db.inc.php
                )

            [function] => require_once
        )

)


Called script: /home/path/to/site/periodic/tags.php

Request parameters:
Array
(
)


--
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=====================================

Database error in SITE NAME
Mysql error:
Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

Debug backtrace:
Array
(
    [1] => Array
        (
            [file] => /home/path/to/site/periodic/notifies.php
            [line] => 22
            [args] => Array
                (
                    [0] => /home/path/to/site/inc/db.inc.php
                )

            [function] => require_once
        )

)


Called script: /home/path/to/site/periodic/notifies.php

Request parameters:
Array
(
)


--
Auto-report system