When I was installing SSL on website, I added new dedicated IP and sub-domain: crm.lawfirm.org.ua. lawfirm.org.ua is pointed to xname dns server and then to a hosting dns - by arvixe. For "crm" subdomain I added A - pointing to new dedicated IP. The problem is that after 3 days sometimes its changing IP to new and it works, and sometimes goes back to old. ping.eu for example showing right IP for monday and tuesday, while others not.
Have you recently changed your nameservers? If I ask
I get a different ip address for
It looks as if you may need to clean up the list of nameservers at