Similar issue just happened to me on my 2016 Chevy Silverado. Keys with fob hanging on a hook in the house, undisturbed. Truck parked in the driveway. The Panic Alarm went off twice within 20 minutes. The first time it seemed to 'time out' before I could get to the fob. The second time, I hit the fob panic button to cancel, but that did not seem to work. Hitting the Unlock button on the fob cancelled the Alarm. No 'Theft Attempted' or other warnings displayed.