In my 2014 ST for the last couple months (ironically, since the warranty expired), the entertainment system will shut itself off after about 10-15 seconds when I try to turn it on while the engine is off. That's when the "System off to save battery." message pops up. When I shut off the engine after a drive, the system will continue to play with no problem. I've checked the voltage when it does this and it shows 12.8 v. Also, the engine cranks just fine, so I'm inclined to think that the battery is still good. Does anyone know how to cure this? Since it would be out of my pocket, it wouldn't be worth it to me to pay a dealer for a small problem like this, but I'd like to fix it if I could.