Reading through Banyon's link, it's most def a voltage issue.
It seems that Ford has a software fix for it assuming it isn't in fact just the battery.
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Might there be a software update? I know my 2018 will restart "if any of the following conditions are met..." among them is, "The battery is not within optimal conditions (battery state of charge and temperature in range." So if there is not sufficient charge, it won't try to engage start/stop either, apparently.
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