Site web down "Service Unavailable"

Hello, I installed ispconfig on amazon ec2, it works very well but after a few hours, I got this error:

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Service Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later.
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by executing:

Code:

systemctl list-units --state=failed

I get :
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● mariadb.service loaded failed failed MariaDB 10.11.4 database server
● php8.3-fpm.service loaded failed failed The PHP 8.3 FastCGI Process Manager
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by restarting mysql and php8.3-fpm, the site works again, but the problem persists after a few hours !
my site is on wordpress and I have not added any articles.

Thank you for your help