Classic ACM freezing issues. My stock response:
Workaround is the common Fuse 79 pull. Proper fix for this is to work with your dealer to update the ACM. This same issue has been documented and fixed on other models like the Fusion. I can also confirm having the ACM updated in my 2013 fixed this issue outright. Haven't had it happen in 4+ years.
The battery being drained completely essentially power cycled it, same as what you'd do by pulling fuse 79. Basically the 'ol 'Turn it off and back on again'.