Нужно наладить связку nginx+php-fpm+wordpress

Периодически страницы не открываются, ошибка 500... помогает перезапуск php-fpm

в логах nginx такие ошибки.

2012/11/07 11:11:06 [error] 19936#0: *592 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 157.55.35.99, server: anisib.ru, request: "GET /tracker.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "anisib.ru"

2012/11/07 11:49:14 [error] 19936#0: *745 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 157.55.35.35, server: anisib.ru, request: "GET /faq.php HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "anisib.ru"

2012/11/07 12:46:01 [error] 19936#0: *963 FastCGI sent in stderr: "PHP message: PHP Warning: Cannot modify header information - headers already sent by (output started at /home/www/anisib.ru/wp-content/themes/aggregate/includes/functions/derwidget.php(25) : regexp code(1) : eval()'d code:40) in /home/www/anisib.ru/wp-includes/pluggable.php on line 881" while reading upstream, client: 66.249.75.224, server: anisib.ru, request: "GET /galereya/prikoly/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "anisib.ru"

2012/11/07 13:16:44 [error] 19936#0: *1221 FastCGI sent in stderr: "PHP message: PHP Fatal error: Class 'Walker_Nav_Menu' not found in /home/www/anisib.ru/wp-content/themes/aggregate/includes/functions/derwidget.php on line 36" while reading response header from upstream, client: 46.50.152.12, server: anisib.ru, request: "GET /wp-content/themes/aggregate/includes/functions/derwidget.php HTTP/1.0", upstream: "fastcgi://127.0.0.1:9000", host: "anisib.ru"

2012/11/07 14:44:59 [error] 19936#0: *1887 readv() failed (104: Connection reset by peer) while reading upstream, client: 66.249.75.224, server: anisib.ru, request: "GET /uploads/posts/2012-08/thumbs/1344871417_cute-comiket-82-day-1-cosplay-015.jpg HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "anisib.ru"

Помогите решить проблему!