Its sounds like you have the infamous dead 12v battery problem where something stays on (or turns on) when the car is parked and runs down the battery. If the voltage doesn't drop too low, everything starts up and you never know about it. Each time it happens though, the 12v battery gets degraded further. You might see it at 12.6 volts but it won't stay there long. I expect you will need a new 12v battery regardless of its age. If it turns out to be old/original, then maybe you'll be OK with just a new one. If it's only a year old then make sure the various Ford TSBs or CSPs have been done (if any apply to the Energi - some don't). Either way, make sure they reset the battery age parameter in the car when the battery is replaced. Then you might check the voltage twice a day when not driven to see what happens. If the new battery isn't staying charged, get a battery maintainer.