Nameserver IPs changing on their own...?

Hello,

This is the second time in 2 weeks that we've had an IP address of a nameserver resort to an old IP that was used nearly 2 years ago... tihs happened on 2 distinct domains at 2 distinct registrars.... is there any reason why this would happen?

I find it very odd, since only we have access to the first domain it happened to, and only our cusotmer had access to the second domain (at different registrars) and no one touched it.

Very od... has this happened to anyone before?

 

 

 

 

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