Random database error

[eluser]Juicie[/eluser]
I'm developing a new site for the company i'm working for. Everything is nearly finished but i'm getting a random database error. 9 out of 10 times everything works great but then I get an error.

A Database Error Occurred

Unable to connect to your database server using the provided settings.

I'm using MSSQL 2005 with the following CI settings:

Code:

$active_group = "default";
$active_record = TRUE;

$db['default']['hostname'] = "---\---";
$db['default']['username'] = "---";
$db['default']['password'] = "---";
$db['default']['database'] = "catalogus";
$db['default']['dbdriver'] = "mssql";
$db['default']['dbprefix'] = "";
$db['default']['pconnect'] = FALSE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = "";
$db['default']['char_set'] = "utf8";
$db['default']['dbcollat'] = "utf8_general_ci";

Could it be a solution to use the ADODB library. Thnx.