[ghisirds]

Hi all, lately, expecially since I changed server, are happening query errors that make my SQL server go down.
I attach someone of them, does anyone know which could be the reason?

Database error in vBulletin 3.8.1:

Invalid SQL:

       SELECT thread.threadid, thread.forumid, thread.title, thread.prefixid, thread.taglist, postusername, postuserid,
           thread.lastpost, thread.replycount,
           forum.title AS forumtitle
           ,post.pagetext AS preview
                             FROM vb3_thread AS thread
       INNER JOIN vb3_forum AS forum ON (forum.forumid = thread.forumid)
       LEFT JOIN vb3_post AS post ON (post.postid = thread.firstpostid)
                            WHERE thread.threadid IN (1403, 528, 451, 68, 3816) AND thread.visible = 1
           AND forum.password = ''
                             ORDER BY lastpost DESC;

MySQL Error   : MySQL server has gone away
Error Number  : 2006
Request Date  : Tuesday, December 22nd 2009 @ 05:13:37 PM
Error Date    : Tuesday, December 22nd 2009 @ 05:32:07 PM
Script        : http://scuo.la/film-libri-musica/3919-nemico-di-classe-spettacolo-teatrale-roma-sul-bullismo-con-le-canzoni-di-vasco.html
Referrer      : IP Address    : 220.181.7.66
Username      : Non registrato
Classname     : vB_Database
MySQL Version :


Database error in vBulletin 3.8.1:

Invalid SQL:

           SELECT fbuid
           FROM vb3_fbuser
           WHERE userid = 2360
           LIMIT 1;

MySQL Error   : MySQL server has gone away
Error Number  : 2006
Request Date  : Tuesday, December 22nd 2009 @ 05:26:07 PM
Error Date    : Tuesday, December 22nd 2009 @ 05:48:18 PM
Script        : http://scuo.la/medicina/818-esperienze-con-everolimus-alias-rad001-alias-afinitor-2.html
Referrer      : http://scuo.la/medicina/818-esperienze-con-everolimus-alias-rad001-alias-afinitor.html
IP Address    : 93.42.166.16
Username      : Non registrato
Classname     : vB_Database
MySQL Version :

Database error in vBulletin 3.8.1:

Invalid SQL:

       SELECT thread.threadid, thread.forumid, thread.title, thread.prefixid, thread.taglist, postusername, postuserid,
           thread.lastpost, thread.replycount,
           forum.title AS forumtitle
           ,post.pagetext AS preview
                           FROM vb3_thread AS thread
       INNER JOIN vb3_forum AS forum ON (forum.forumid = thread.forumid)
       LEFT JOIN vb3_post AS post ON (post.postid = thread.firstpostid)
                         WHERE thread.threadid IN (1403, 528, 451, 68, 3816) AND thread.visible = 1
           AND forum.password = ''
                           ORDER BY lastpost DESC;

MySQL Error   : MySQL server has gone away
Error Number  : 2006
Request Date  : Tuesday, December 22nd 2009 @ 05:13:37 PM
Error Date    : Tuesday, December 22nd 2009 @ 05:32:07 PM
Script        : http://scuo.la/film-libri-musica/3919-nemico-di-classe-spettacolo-teatrale-roma-sul-bullismo-con-le-canzoni-di-vasco.html
Referrer      : IP Address    : 220.181.7.66
Username      : Non registrato
Classname     : vB_Database
MySQL Version :

Thank you.