Session cach and tmp folder error

Hello,

One of my clients has come across multiple breakdowns in their websites with the following error

PHP:

Warning: session_start() [function.session-start]: open(/tmp/sess_1d6616afe1b8a0d91a8d9ec29254b453, O_RDWR) failed: No space left on device (28) in
 /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cookie - headers already sent by (output started at 

/home/***/public_html/index.php:104) in /home/***/public_html/system/library/session.php on line 11Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /home/***/public_html/index.php:104) in 

/home/***/public_html/system/library/session.php on line 11Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in 

/home/***/public_html/index.php on line 177Warning: Cannot modify header information - headers already sent by (output started at /home/***/public_html/index.php:104) in 

/home/***/public_html/system/library/currency.php on line 45Notice: Error: Can't create/write to file '/tmp/#sql_4c5_0.MYI' (Errcode: 28)
Error No: 1

They are experiencing this problem while:

• Nothing has been recently changed on the server
• tmp and other folders are occupied with not more than 10% of their total space
• The error come and goes

I would really appreciate it if anyone could guide me through.

Thanks in advance

 

Thanks for your reply.

I checked what you mentioned, and all seemed fine,. Do you have any other suggestion on what could've caused this issue?