It's been doing this and getting worse. I'd say about 8 out of 10 times trying to start the truck it will turn over but wont fire up and the little theft light in the gauges will be flashing. Turn the key back to off and then the theft light goes off. Try to restart and it may and may not start and then have to go through the same process again until it fires up and starts. Once running, doesn't seems to be any further issues. Any ideas? Could my key be going bad? I bought it used and the dealer only gave me one key with it and the key always had a little crack in the corner.