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.