VBulletin Database Errors

[whitetailworld]

I've been getting these errors quite often. Probably 3 to 5 per day. I'm not sure if it's a hosting issue, spammer issue, or something else. Any help or direction is very much appreciated!

Here's the email I get sent.

Database error in vBulletin 4.2.0:

Invalid SQL:
DELETE FROM adminutil WHERE title = 'sitemapsession';

MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Wednesday, May 14th 2014 @ 06:59:02 AM
Error Date : Wednesday, May 14th 2014 @ 06:59:33 AM
Script : http://forums.whitetailworld.com/cro...and=1398982718
Referrer :
IP Address : 65.55.215.37
Username : Unregistered
Classname : vB_Database
MySQL Version :