dns problem for .gr domains

Good day,
I have a problem with DNS, with domain name (.gr). After 1-2 hours, DNS is lost for about half an hour and after that it recovers.
This happens to all servers. My name servers are ok though.
What do i have to do to fix this problem??

THERE IS A SOLUTION

Good day,
I have a problem with DNS, with domain name (.gr). After 1-2 hours, DNS is lost for about half an hour and after that it recovers.
This happens to all servers. My name servers are ok though.
What do i have to do to fix this problem??

It can take up to 48 hours for DNS to fully propagate, during that time you will experience symptoms like you have described.

You can enter your domain here to check for errors.

https://intodns.com

This is happening for more than six months.

Did you put your domain in intodns to check for DNS errors?

Γεια σου Θωμά,
or you can use https://dnschecker.org/ put nameserver to see if propagation is complete