Problem with CGI::Fast process

Dear FCGI users:

I am very new to FCGI, so please bear with my silly questions.: -)

My problem is whenever I make a fatal error in my FCGI script
(mason_handler.fcgi), any visit to my website will stuck. I can not
see the FCGI process through:

   ps aux | grep fcgi

Even if I correct the error, the FCGI process often comes back after
more than 10 minutes. I am not sure how and why this takes so much
time to recover from an error in the FCGI script?

If I update other code, I can use 'kill -9' to restart my FCGI
process. but in this case, my FCGI process can be invoked and I dont
know how to get my FCGI script back to work immediately after I
correct the error.. Is this normal or abnormal in FCGI and Perl ??  My
FCGI script is as following and I am using CGI::Fast 1.07, HTML::Mason
1.36, Apache 2.0.59, mod_fastcgi/2.4.2, the latest Debian box..

Thank for your time

LH

============== mason_handler.fcgi =============
#!/usr/bin/perl

use strict;
use warnings;
use CGI::Fast;
use HTML::Mason::CGIHandler;

{
    package HTML::Mason::Commands;
    use MyApp::Utils qw[ :myapp ];
    use DBIx::Simple;
    use YAML;
}

# lazily-instantiated variables
my $cgi;
my $h;

while ($cgi = new CGI::Fast())
{
    my $h ||= HTML::Mason::CGIHandler->new
    (
        comp_root     => '/shared/lihao/public_html',
        data_dir      => '/shared/lihao/var/mason/',
        allow_globals => [ qw/ $db %session / ],
        error_mode    => 'fatal',
    );

    # hand off to mason
    eval { $h->handle_cgi_object($cgi) };
    if (my $raw_error = $@) {
        print $raw_error;
    }
}

exit 0;
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