GTM using WideIP along with DNS zone transfers to ISP
We are testing using Wide IP for load balancing and health checks for a mobile application. We believe we have everything configured correctly and load balancing and failover were working as expected. I setup my mobile device to monitor / test the setup and a few days later I got an error stating it was unable to connect. Everything looked ok on the GTM and the error went away on my phone by itself. It seems to be intermittent working most of the time, which is making it hard to troubleshoot.
After some more digging I found we are doing DNS zone transfers to our ISP's DNS servers which potentially could be answering DNS queries. Based on what I have read about the GTM and Wide IP setup this maybe part of the problem I am trying to solve and or cause more problems down the road.
Suggestions?