unusual DNS problem

We are hosting around 50 websites on Linux dedicated server. For last few months, we are facing an unusual problem with the server and ISP.
after every 3-4 days, our sites stop rendering on some geographical locations but works fine at other locations.
I contacted my internet provider and he said that there is problem with your server
s DNS records and when I contacted my server guys, they said that the problem is with your ISPs DNS records..
I am not able to comprehend what the exact problem is.

i appreciate any sort of help..
Thanks

 

 

 

 

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