[Plugin: WP Super Cache] Lots and lots of 'rename' error messages

Hi,

We’re getting lots of error messages that look like the example below. This exact error has come up 38 times in the last 30 minutes (583 in the last 12 hours). Other ‘rename’ errors of the same kind but a different URL, are also showing.

I hope the stack trace is useful. Let me know if I can help fix it.

Thanks
Joss

Error message

Error: rename(/var/www/html/wp-content/cache/16905825404fcae7bef185b5.52339662.tmp,/var/www/html/wp-content/cache/blogs/maenglish.blogs.lincoln.ac.uk/wp-cache-maenglish.blogs.lincoln.ac.uk970659cc43c41072165f58726f610d17.html): No such file or directory

Stack trace

… called at /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php (581)
… called at /var/www/html/wp-content/plugins/wp-super-cache/wp-cache-phase2.php (313)
in wp_cache_ob_callback called at ? (?)
              in ob_end_flush called at /var/www/html/wp-includes/functions.php (3335)
in wp_ob_end_flush_all called at ? (?)
         in call_user_func_array called at /var/www/html/wp-includes/plugin.php (405)
                      in do_action called at /var/www/html/wp-includes/load.php (556)
in shutdown_action_hook called at ? (?)

http://wordpress.org/extend/plugins/wp-super-cache/