ERROR in forge [email protected]: systemd monitor interval set to 10000ms

I am trying to process an email for 9k users

        foreach ($users as $user) {
            Mail::to($user->email)
             ->queue(new BlogPostMail());
        }

Esto funcionaba bien con [email protected] But since I installed [email protected] after 10 seconds I get error 500, and in the LOG of forge I get the following:

[25-Nov-2021 12:18:28] NOTICE: ready to handle connections
[25-Nov-2021 12:18:28] NOTICE: systemd monitor interval set to 10000ms
[25-Nov-2021 12:27:33] NOTICE: Reloading in progress ...
[25-Nov-2021 12:27:33] NOTICE: reloading: execvp("/usr/sbin/php-fpm8.0", {"/usr/sbin/php-fpm8.0", "--nodaemonize", "--fpm-config", "/etc/php/8.0/fpm/php-fpm.conf"})
[25-Nov-2021 12:27:33] NOTICE: using inherited socket fd=7, "/run/php/php8.0-fpm.sock"
[25-Nov-2021 12:27:33] NOTICE: using inherited socket fd=7, "/run/php/php8.0-fpm.sock"
[25-Nov-2021 12:27:33] NOTICE: fpm is running, pid 31838
[25-Nov-2021 12:27:33] NOTICE: ready to handle connections
[25-Nov-2021 12:27:33] NOTICE: systemd monitor interval set to 10000ms

Do you have any ideas?

PD: Also I have to say that I upgraded the server to 18.04.6