Yes, we have a service account, that previously was not an administrator that was used to start/stop cache.  We installed using an administrator account in both instances.  The change seems to have happened when we upgraded to 2017.2 from 2017.1.  On 2017.1 we were able to start/stop cache without being an administrator.  Our service account was able to failover properly without being an administrator.  After the upgrade, the failover process failed when attempting to stop cache.  The CConsole.log does not show any errors, or anything related to shutdown which surprised us.  

Ultimately we have the issue solved by adding our service account as an administrator on the boxes, but we preferred to not do that as it seems to be overkill.  

We have opened a ticket in regards to this issue and will work it from that angle now.  

I appreciate your help, if we find a resolution I will come back and post it here in case others experience the same issue.