Due to an unknown issue with ADSync crashing, I have setup a recurring job that starts the ADSync service once a day at 5am. As much as I hate work arounds like this, I have been unable to find the root cause despite several phone calls with Microsoft. 

WINADC Server

Task Scheduler > Microsoft > Windows

Trigger:

  Daily at 5am regardless of logon

  Run with highest privs. 

  Run as Kamitadmin user

Action:

  Program: C:\Windows\System32\net.exe

  Arguments: start ADSync

Settings:

  Stop the task if it runs longer than: 1hour

The job will run until the service reports Running state.