Wordpress often loses database connection (mariadb on its own container)

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Update: I set the debug flag in Wordpress and now receive the exposed error:

Warning: mysqli_real_connect(): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /var/www/html/wp-includes/wp-db.php on line 1753 Warning: mysqli_real_connect(): (HY000/2002): php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution in /var/www/html/wp-includes/wp-db.php on line 1753

php_network_getaddresses: getaddrinfo failed: Temporary failure in name resolution