Konu açarken ara sıra db hatası alıyorum tabloları onardım ama sorun düzelmedi bu sorun hep oluşmuyor ama arada alıyorum

Database error in vBulletin 3.8.5:
 
Invalid SQL:
 
(SELECT permissions, permissions2, FIND_IN_SET(forumid, '268,99,1,-1') AS pos, forumid
FROM moderator
WHERE userid = 1 AND forumid IN (268,99,1,-1)
ORDER BY pos ASC
LIMIT 1)
UNION
(SELECT permissions, permissions2, 0, forumid
FROM moderator
WHERE userid = 1 AND forumid = -1
);
 
MySQL Error : MySQL server has gone away
Error Number : 2006
Request Date : Tuesday, September 14th 2010 @ 08:22:13 PM
Error Date : Tuesday, September 14th 2010 @ 08:22:54 PM
Script : ????????Referrer :???????????IP Address : ????
Username : ????
Classname : vB_Database
MySQL Version :