I’ve had a problem with my comments for a few days now.
Readers can not comment or sometimes it works and sometimes not.
The following error message appears: Service Unavailable
The server is temporarily unable to service your request due to downtime or capacity problems. Please try again later.

This basically says that your server is running out of breath. Normally any error does output additional details that provide information on the origin and type of error.

Please check the error logs on your server for a more specific error message, which may give a clue to why this is happening on your website/server. If you need help locating them, ask your hosting provider to help you with that.

If you cannot find error logs or if you don’t find any helpful info in the error logs, try Enabling debugging