Thank you for the response.

We started to see in the Adwords console,  Ads previously approved and running were not being shown and we could not tell why.  By the latter half of the next day things were back normal.

All we could think of,  was perhaps the DNS/IP changes  created the need for Google to pause the ads and re-validate the domain.

What impact (if any) does IP or DNS changes, have on paid search campaigns?

We recently performed an upgrade to our sites that required a datacenter change (but within the same region East US)  and DNS change.  We believe there may have been an impact to our ad campaigns in the form of suppression of our ads following the change, specifically - Google Adwords.

Is there any information regarding this issue or has anyone experienced this before?

Thanks