Data Base error caused by host?

[Blooded]

Hello from time to time i got this error

Database error in vBulletin :

mysql_connect() [function.mysql-connect]: Can't connect to MySQL server on 'hostingmysql.hostname.com' (4)
path/includes/class_core.php on line 313

MySQL Error :
Error Number :
Request Date : Friday, August 13th 2010 @ 01:27:25 AM
Error Date : Friday, August 13th 2010 @ 01:27:35 AM
Script : http://mysite.com/ajax.php
Referrer : http://mysite.com/forum.php
IP Address : xxxxxxxx
Username :
Classname : vB_Database
MySQL Version :

Is it because of the host?Will i have to get a bigger one in the near future?

Thanks in advance