This just happened to me here are my stats.
2015 SL
Timer set to fully charge by 6AM
Wife plugged it in at 9PM night before (car windows down)
I went in (leaning through window without opening door) and turned it on to see the current charge 20%
Turned it off and heard the EVSE cycle on and...
Same thing is happening to me. I noticed out of the corner of my eye that the yellow triangle light would flash on from time to time. Today both VDC and yellow braking light stayed on while driving. I power cycled the car and it went away. I am going to the dealership tomorrow to have them...