Hollo. Appreciate any help. 2013 mustang gt

I fixed up a 3rd key that was an origional but wasnt programmed to my car. Long story why it needed to be programmed. So i programmed the key and my car starts and runs fine. Next day immobilizer kills my car 1 mile down the road. Used a code reader and found theft detected vehicle immobilized. So i figured something wrong with they key i had put back together. Bought an aftermarket key, programmed and works. Next day immobilizer kills my car 1...

Immobilizer issue with new keys