Frequent database connection error

I have a droplet with Nginx & MariaDB. There are several WordPress sites are installed, mainly blogs with authentic plugins. I have been facing severe issues like database connection errors frequently - once weekly and all my sites go down. Then I have to restart - PHP FPM, Nginx and MariaDB manually from terminal and all the sites go up. This becomes a continuous process every week. So, it is a huge pain and I want to resolve this issue permanently.

Please suggest how to resolve this.

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SAME issue for my blog SRS creations it is wordpress based blog and getting 60k views monthly can any one here help me to get out of it. due to this am loosing so many visits to my blog

Check for oom killer in /var/log/syslog. If it’s there, reduce memory usage or upgrade your droplet.