paster randomly crashes silently

[jodok]

he notice that every 1-2 weeks our applications silently crash. no log entry, nothing.

all we do is:

e.g. beta1.ini

#!/usr/bin/env /server/zl-beta/deploy/static/bin/paster

[DEFAULT]
debug = True
serverPort = 9911

[exe]
command = serve
daemon = true
user = zl-beta
group = zl-beta
log_file = /data/zl-beta/log/paster-1.log
pid_file = /data/zl-beta/run/paster-1.pid

[app:main]
use = config:/server/zl-beta/deploy/static/base.ini#main

[server:main]
use = config:/server/zl-beta/deploy/static/base.ini#main

base.ini:

[app:main]
use = egg:lovely.static

[server:main]
use = egg:paste#http
host = 0.0.0.0
port = %(serverPort)s
#threadpool_workers = 4
threadpool_spawn_if_under = 10
#threadpool_max_requests = 0
threadpool_error_email = sysadmin@lovelysystems.com

any idea?