Temporary Folder Doesn't Empty

I’ve had my worpress site since May 2011. All of a sudden, since the end of August, I started to have this issue where the temporary folder wasn’t automatically emptying out, and I would get the below error on my website. My host is godaddy, and they keep telling me it’s wordpress’s fault, something about the coding. The theme I have on my wordpress is market-theme. Can someone help me in order to prevent this in the future. Thanks.

Warning: session_start() [function.session-start]: open(/var/chroot/home/content/30/7811030/tmp/sess_gq0026naos9ka94b18kd8bd4g7, O_RDWR) failed: File too large (27) in /home/content/30/7811030/html/wp-content/themes/mk4/functions.php on line 10

Warning: session_start() [function.session-start]: Cannot send session cookie – headers already sent by (output started at /home/content/30/7811030/html/wp-content/themes/mk4/functions.php:10) in /home/content/30/7811030/html/wp-content/themes/mk4/functions.php on line 10

Warning: session_start() [function.session-start]: Cannot send session cache limiter – headers already sent (output started at /home/content/30/7811030/html/wp-content/themes/mk4/functions.php:10) in /home/content/30/7811030/html/wp-content/themes/mk4/functions.php on line 10