Hi,
i have a big problem:

Ubuntu Server 10.04 without reason slow down and freezes.
When is it in freeze i can ping it, but with a big latency, but i can't connect ftp shh and can't load a webpages.

On this server i have installed wordpress and prestashop.

I want understand what is the problem that causes the freeze of this webserver:

From apache2 error.log i see in the moment of the freeze this error:

Code:
[Tue Jun 05 16:28:07 2012] [error] [client 89.121.253.227] client sent HTTP/1.1 request without hostname (see RFC2616 section 14.23): /w00tw00t.at.ISC.SANS.DFind:)
[Tue Jun 05 16:51:46 2012] [error] [client 180.76.6.233] PHP Warning:  mysql_connect(): Lost connection to MySQL server at 'reading authorization packet', system error: 104 in /var/www/store/classes/MySQL.php on line 34
[Tue Jun 05 16:59:34 2012] [error] [client 66.249.71.238] PHP Warning:  mysql_connect(): Lost connection to MySQL server at 'sending authentication information', system error: 32 in /var/www/store/classes/MySQL.php on line 34
[Tue Jun 05 17:04:31 2012] [error] [client 66.249.71.238] PHP Warning:  mysql_connect(): Lost connection to MySQL server at 'sending authentication information', system error: 32 in /var/www/store/classes/MySQL.php on line 34



Sorry for the bad english