vBulletin 4.2.3 Database ERRORS driving me crazy

[diysmps]

We are suffering from this issue since we had the VB installed years ago, it used to happen from time to time, without finidng the answer why its happening.

We are unable to find a proper solution to this issue at the VB forums, but hopefully tihis time we will.


Problem is we are getting thousands of emails notifying us with the database errors.

Database error in vBulletin :

mysql_connect(): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2) /var/www/vhosts/diysmps.com/forums/includes/class_core.php on line 317

MySQL Error :
Error Number :
Request Date : Thursday, December 1st 2016 @ 01:57:40 AM
Error Date : Thursday, December 1st 2016 @ 02:05:54 AM
Script : http://www.diysmps.com/forums/entry....S&goto=newpost
Referrer :
IP Address : 46.229.168.72
Username :
Classname : vB_Database
MySQL Version :

Can any one help us to get rid of this painful problem? COMPLETELY?

In the past we had to change our host from GODADDY to Rackspace, we thought its the HOST.

And its NOT, its the VB itself.

Please help