I have a 2018 Trax - came home, turned the radio off (yes, held the center button 3 seconds)got out of the car and locked it as usual. About 40 minutes later my sister came to my house and noticed the radio was on as she walked up the driveway. I went out and turned it off. An hour later, realized it was on again. I turn it off, about a minute later it comes back on. No key in the ignition.