First two things that I would consider is a bad battery or a bad alternator. We just replaced our battery on the 2013 because it would fully charge, showing no problems, and the next day it was dead. New battery in for a month now and no problems. Mechanic said the old battery held a charge, just not a strong enough charge for this car. Otherwise, check your ground cable on the battery. Make sure the spot it is grounded to is not corroded or has too much paint not allowing it to ground properly. On our 2015, we had a starting problem and it was there ground. I cleaned it up completely, removed some of the paint and no issues in over a year.
If you already got it fixed, post what you did.