random errors

hello,

i have a debian sarge system with apache2.0.54 and php 4.3.10-16
(cgi-fcgi) and mod_fastcgi installed using apt-get (+suexec2). i would
like to have a web server with several virtual hosts, each one running
php (and later maybe other) scripts as their own users.i'm not sure if
this problem should be posted here but i hope you can help.
i have the system up and running, so scripts are run as their owners,
every virtual host can have it's own php.ini and so on. the system is
fortunately not in production yet, so i have the time to mess up
everything :)
so the problem is that i frequently get 2 errors following each other,
and after that happening, i can do nothing with php. sometimes not
even the restarting of the webserver is enough.for example, this wan
in error.log after a restart i've just done:
[Sat Feb 18 09:01:50 2006] [notice] Apache configured -- resuming normal operati
ons
[Sat Feb 18 09:34:27 2006] [error] server reached MaxClients setting, consider r
aising the MaxClients setting
[Sat Feb 18 09:34:34 2006] [alert] [client 213.178.105.234] (2)No such file or d
irectory: FastCGI: failed to connect to (dynamic) server "/data/files/near.hu/pu
blic/cgi-bin/php": something is seriously wrong, any chance the socket/named_pip
e directory was removed?, see the FastCgiIpcDir directive
[Sat Feb 18 09:34:34 2006] [error] [client 213.178.105.234] FastCGI: incomplete
headers (0 bytes) received from server "/data/files/near.hu/public/cgi-bin/php"
the always-appearing error-messages are the last two ones, but the
maxclients is also strange, as the server is only being used by me
(and some other funny guys who are looking for old mambo-versions and
so on), so i hardly believe the maxclients limit were reached
(especially after a restart).
the strange with the other 2 errors is that they appear randomly, so
nothing changes but suddenly php stops working (eg i'm working with
phpldapadmin and i get 500-internal server error once..).
(/cgi-bin/php is the tiny shell script you can see everywhere to
export the phprc value).
if you think this problem has nothing to do with fastcgi, please tell
me and i'll try to ask it on other lists.
thanks in advance
adam

my configs:
/etc/apache2/mods-enabled/fastcgi.conf

<IfModule mod_fastcgi.c>
 #AddHandler fastcgi-script .fcgi .fcg .fpl
  AddHandler php-fastcgi .php .php4 .phtml

  FastCgiWrapper /usr/lib/apache2/suexec2
  FastCgiIpcDir /var/lib/apache2/fastcgi
  #FastCgiConfig -singleThreshold 100 -killInterval 300 -autoUpdate -pass-header
 HTTP_AUTHORIZATION

  Action  php-fastcgi  /cgi-bin/php
  #

  AddType application/x-httpd-php4  .php .php4 .phtml
  #AddType application/x-httpd-php5 .php5

</IfModule>
<Location /cgi-bin/>
  Options ExecCGI
  SetHandler fastcgi-script
</Location>

in the virtual host:
 ScriptAlias /cgi-bin/ /data/files/xy.hu/public/cgi-bin/
 SuexecUserGroup xy.www xy

and the shell script (/cgi-bin/php)
#!/bin/sh
PHPRC="/etc/php4/cgi"
export PHPRC
PHP_FCGI_CHILDREN=4
export PHP_FCGI_CHILDREN
exec /data/files/xy.hu/public/cgi-bin/php4

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