Hello all and thanks for the help in advance.

Issue started when daily temps started to climb. Key works just fine to open doors and turn ignition. It would start eventually, but has made me late a couple times. I'm sure it is a transponder issue. I ordered another key because I only had one when I bought the car and I know similar issues happen with the cars that I work on. That didn't fix it. I've done few searches here and on google and only found old threads that didn't have fixes. A another tech here used to work for BMW and says that it might be the sensor ring for the ignition, but I want more opinions before I throw more parts at it. I don't have a decent scanner available for a few more days. Any ideas?