Quick update, my car's still at the dealership. They've been able to reproduce the issue but again the car's not throwing any codes. My SA states the shop foreman is now working on it and going to take it on drives / extended drives with it hooked up to a scanner for data logging. They're also working with BMW NA to figure out what's happening.
I mentioned BMW SIB 12-21-12 again on the phone call but I don't want to be too pushy as I've been to this dealership for SULEV repairs / basic maintenance and they're good people. Stated they want to find out exactly what is happening so that they're not just guessing at repairs and billing me for it which I appreciate.
I'm scared guys
