Welcome to the forums. It sounds like either the chip in the key, or the sensor in the ignition lock is about to bite the dust. If it happens, it can disable the truck by not allowing it to crank over, or not turning the fuel delivery system on. There are forums for trucks in general, as well as model-specific forums, on the internet.
Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.