So I have a 2007 dodge 2500 with a 5.9 Cummins. A few weeks ago it’s started to go in theft mode. It would crank and run for a few seconds and shut off. It was acting like it key didn’t work. Wouldn’t unlock the docks or anything out a new battery in it and still nothing. Took it to the dealership now they cut a new key and work great for a week and same thing happened. Also I put new batteries in it because one was bad and after seating for a week at the farm both batteries are dead and there brand new. It’s like something is draining them ??? What could be causing all this ???? Thank you