[chickenxgeorge]

I think you may be onto something with the RDC/TPMS Module.

I called a local BMW dealer and talked to one of their service managers. I explained my issue and asked about the probability of the TPMS module causing a complete electrical shutdown. He said it is definitely possible as all of the modules on the Fiber-optic BUS are connected in series, and if one goes out it can cause the others to lose connection as well.

I don't think there is anyway to test the module myself. The service manager said they can run some diagnostics for around $140. May see if the car can make it without having another shut down.

More to come.