To close out this topic I called Firefly and reviewed the actions that would cause the AGS to disable.
1) Turning the ignition key
2) Pressing the brake peddle - not sure I have this one right
3) exceeding 4 hours of generator time.
As the AGS has worked flawlessly since, I am inclined to say it was #3 above - I hit the max run time.
Thanks for helping me out.
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