But we are reaching the worst I can accept.
I hate having to say so, but in case you are not able to solve the problems with DNSs for the server 67.15.16.19 I will be definitely forced to leave your service. I have hosted here one Windows Special plan and one Linux customised Reseller plan for more than 1 year now and I was a happy customer until MySQL outages and slow responses from DNS came up a few months ago in the Linux server 67.15.16.19.
For your reference:
About VERY VERY slow answer times
Now it is ns8,hostony.com the one not answering and scores are always F (sometimes even worse... timeout)