Adobe Acrobat Pro 11.0.x shut-down itself

Adobe Acrobat Pro XI (11.0.x) is shutting down 15 seconds after launch from Windows 7 Desktop in Enterprise Environment.  We started seeing the issue on a Tuesday of this week.  The day before, there were no issues or explanation for root cause.  The symptom is that Adobe Acrobat Pro XI can only stay up and running for 10 - 15 seconds; behind the scenes, it appears that the Enterprise license check fails and the results in Acrobat Pro XI aborting and closing with no message or error prompts.

1. This is occurring with 2% of the Adobe Acrobat Pro installation base at this time.
2. Confirmed that the issue is not related to Adobe Acrobat Pro XI Patch Level
3. The problem was recreated with Acrobat Pro XI base version 11.0.0, version 11.0.13 and the latest version, 11.0.16.
4. There are abnormal Adobe Acrobat Pro license activation activities:
   1. We have a volume license; the activation should not happen.  this is a primary investigation focus.
      1. We received the license and serial code in 2014.
      2. Adobe Acrobat Pro XI is running in our environment since 2015.
   2. From observation is looks as though license activation cannot recognize the license key.