Lighttpd

after about 24 hours running under moderate load (40-50 req/s) i keep getting this in my logs and the server becomes unresponsive. not sure if this a bug or a problem on my end? if this is not a bug i apologize as I just recently went from 1.4 to 1.5 and hadn't experience this problem before.

2009-05-31 21:48:04 (trace) (mod_proxy_core.c:1448) connecting to address unix:/tmp/php-fastcgi.sock (0x97b1928) failed, disabling for 60 sec
2009-05-31 21:48:04 (trace) (mod_proxy_core.c:2330) backlog: all addresses are down, putting /index.php (25) into the backlog, retry = 2
2009-05-31 21:49:06 (error) (mod_proxy_core.c:932) connect(unix:/tmp/php-fastcgi.sock) failed: Resource temporarily unavailable (11)

config:

$HTTP["url"] =~ "\.php$" {
proxy-core.balancer = "round-robin"
proxy-core.allow-x-sendfile = "enable"

1. proxy-core.check-local = "enable"
   proxy-core.protocol = "fastcgi"
   proxy-core.backends = ( "unix:/tmp/php-fastcgi.sock" )
   proxy-core.max-pool-size = 16
   }

startup:

/usr/local/bin/spawn-fcgi -s /tmp/php-fastcgi.sock -f /usr/local/bin/php-cgi -u csplanet -g csplanet -C 5 -P /var/run/spawn-fcgi.pid