How can I fix this problem
my site url: www.sonper.net

Sometimes I get these messages in my site
This message appears in the header
Warning: session_start() [function.session-start]: open(/data/tmp/sess_5a1955d5d87e60a1ec92438453340b27, O_RDWR) failed: File too large (27) in /data/22/2/34/155/2034481/user/2228116/htdocs/sn/includes/libs/ss.inc.php on line 25

This message appears in the footer
Warning: Unknown: open(/data/tmp/sess_5a1955d5d87e60a1ec92438453340b27, O_RDWR) failed: File too large (27) in Unknown on line 0

Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/data/tmp) in Unknown on line 0

tahnks

Seems your session doesn't work, please check your server settings.

Check your site please in another pc this also could be from your browser settings ... if you are using firefox check in ie or chrome to check if its is from the server site or browser!!!! because u said sometimes !!!!