i3 EME issues

My month old BEV has been taken in twice now for error messages: "Transmission Malfunction" and "Drive train Malfunction".  After spending 4 days at the dealer undergoing software updates and diagnostics, they sent me home.  A few days later the same error messages started up again.  Now they have ordered a new EME and it will take several days to install.  I hope to have my new car back before Thanksgiving - would like to show it off to company!  Has anyone had an EME replacement?  I understand it's quite a big job.  I would like to know if it actually works to stop the problems.  Also, after it was return the first time, I had it plugged into my home station and while in my house I heard a loud noise.  It sounded like it was coming from underneath the car which it was once I returned to to garage to investigate.  The charge station was flashing it's "Trouble" light.  I unplugged and plugged several times before the noise stopped and I was able to charge.  I hope the new EME solves that problem as well.  Anyone have either of these problems?