pligg site stops working shows blank pligg site

[liyaroy]

The problem is not stable, usually the site loads well but sometime it shows blank pligg website.... (Friend Lane - Your Source for Social News and Networking)

cache/log.php showing following error

[01-Jun-2012 02:11:27] PHP Warning: Error establishing mySQL database connection. Correct user/password? Correct hostname? Database server running? in /home/friend/public_html/libs/db.php on line 90
[01-Jun-2012 02:11:27] PHP Warning: MySQL database connection is not active in /home/friend/public_html/libs/db.php on line 134



[01-Jun-2012 02:07:56] PHP Warning: include_once() [<a href='function.include'>function.include</a>]: Failed opening './modules/captcha/captchas//recaptcha/main.php' for inclusion (include_path='.') in /home/friend/public_html/modules/captcha/captcha_main.php on line 103


[01-Jun-2012 02:07:56] PHP Notice: Undefined variable: dblang in /home/friend/public_html/libs/dbtree.php on line 187

[01-Jun-2012 02:07:36] PHP Notice: Undefined index: groupview in /home/friend/public_html/cache/templates_c/c_1_wistie_sidebar_modules_categories_tpl.php on line 43

the log.php files grows to 500 mb in 2 days... should i delete the cache/log.php file

Your help will be appreciated...
Thanks on Advance

[UnderDogg]

You have 2 problems. 1 is that you sometimes cannot connect to the mySQL database server. (MySQL database connection not active)
Try to find out why (sometimes) your mySQL connection is not active. Maybe your host can help

2) your log files grows 500MB in 2 days. try to find out which entries gets logged in 1 day.