Always "Can not connect to MySQL server"


Why I always often receive such information:

“There seems to have been a problem with the database of your Discuz! Board
Discuz! info: Can not connect to MySQL server
Time: 2006-6-8 4:54pm
Script: /Discuz/logging.php
Error: Lost connection to MySQL server during query
Errno.: 2013”

Probability that my forum user meets this kind of state is not high,About hundreds of users will have such a state will take place in one.
Request every expert, help me and solve this problem
Thanks everybody! !