Problems with resolving domains

Recently, I changed my server and the IP changed also.

After a couple of days I had a few of my customers saying that their domains would resolve for a few hours, then not resolve for a few hours - on and off. This was only a small number of clients.

I monitored their websites with 2 3rd party monitoring checkers and found no dns issues - their sites always worked when i accessed them. I told them to try the ipconfig /flushdns etc, but problems still exist.

Does anyone know what might be causing this?

Thanks!

 

 

 

 

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