mySQL cannot connect?

[AFemaleProdigy]

My boards run fine and then randomly put out errors and won't load. Any help? I know it's saying "can't connect", but why would it only do this every once in a while and not all the time? Would this be a server problem or a code problem? Error reporting gives me the following error....

Database error in vBulletin :

mysql_connect() [<a href='function.mysql-connect'>function.mysql-connect</a>]: Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)
/home/tf3131/public_html/forums/includes/class_core.php on line 273

MySQL Error :
Error Number :
Date : Thursday, February 22nd 2007 @ 07:00:30 PM
Script : http://www.talkingfootball.net/forums/cron.php?rand=677659
Referrer : http://www.talkingfootball.net/forums/
Classname : vb_database

I just got this other error too....

Database error in vBulletin 3.6.4:

Invalid SQL:

SELECT title, template
FROM template
WHERE templateid IN (426,133,134,439,136,440,138,139,141,142,143,144,1 45,140,462,449,382,
240,206,207,377,380,389,226,227,228,229,340,394,39 3,395,398,430,433);

MySQL Error : Server shutdown in progress
Error Number : 1053
Date : Thursday, February 22nd 2007 @ 07:06:47 PM
Script : http://www.talkingfootball.net/forums/