Update April 2022
After trying unsuccessfully to install an email server some months later the syetm started playing up once a new Encrypt certificate was requested.
In trying to restablish via Certbot I started loosing connections.
Failing to remedy the problems and they worsend I reinstalled the OS and started from scratch. I had to do this twice.
Today I rewired the power supply, and I had notice the server getting hot.
Current status is that Apache2 and php7.4 are working.