The connection is not confidential, install the certificate

There was information from the hosting that they were installing a certificate for a year. But something on the server jams it every 3 months regularly. Now its work has been resumed.
What could be the problem? And isn't it caused by us?

Good day.
The certificate for the year was not installed on your server.
The server has a certificate from Let's Encrypt for a period of 3 months, and today the hoster renewed this certificate.
By the way, the system is installed on your server, so you need to monitor the server, certificates... so what.

Thank you for your reply.
How much does it cost to install an eternal certificate for https://box1.luxshina.ua/desktop/?
Is it possible to install such a certificate on https://luxshina.ua/ and how much will it cost?
Please issue an invoice.

Good day.
Unfortunately, nothing eternal exists in our world.
ssl certificates are issued by specialized certification centers for a period of 1 or 2 years.
You can buy such an ssl certificate from a certificate authority, then this certificate must be installed on the server.
It is also possible to install a free certificate from Let's Encrypt, such a certificate is issued for a period of 3 months with the possibility of its extension.
Currently, a certificate from Let's Encrypt is installed on your server for a period of 3 months.
We do not know why the automatic extension does not work, because we did not configure this functionality.
Installing a domain certificate - 1 hour.

How much does it cost to set up automatic certificate renewal?

1 hour

Is this for two systems? https://box1.luxshina.ua/desktop/ https://luxshina.ua/

Thank you for your reply. It is not yet time to implement the estimated. We will inform you. Good day!