I had the same exact problem, and was told to take off my battery wires, and use a pair of pliers to "crush" (attach firmly) the wire connectors. Reattach wires to the battery securely.
I'm starting to see a lot of people reporting this problem. How do we start an effort to have Jeep issue a recall to fix it? I took my 2012 JKU to a dealership and they had no idea what it was.
Let us know if this fixes your problem. It worked for me.