My 2015 LT Crew cab has about 24K miles. 2 weeks ago I was starting to have those service Stabilitrack and service Theft Deterrent System messages popping up on the onboard computer (on separate occasions). Once in a while the car would shut down while I was driving and start back up right away, then the OBC would reset and tell me to roll down the driver window then roll it back up again to recalibrate the system. I brought it in to the dealership, and they determined it was a bad battery; it was not drawing enough voltage to those systems. They replaced it under warranty and everything is fine again...so far. While this was happening, I did notice the voltmeter gauge in the dash is constantly stay above 14V (around 16V) while the car is running. Now with the new battery, the gauge is show around 12-13V, like before. I'm no battery expert, but maybe that's a sign that it's going bad?
Full disclosure, I have a Baja Designs 30" lightbar and Pace Edward electric tonneau cover. I was glad the service advisor didn't try to blame the issue on those things hooked up to the battery, even though they are not drawing constant power from the battery.