Hi I seem to have the same issue, my bike is a 2016 model with 3000km on the clock. It went for a service and I did 200kms since the service a month ago. I did notify the dealer that there was some coolant leaking from the little hole on the left side prior to them collecting it for the service, they responded by saying it was probably just overfilled. So after doing the 200km on Sunday after the service, I noticed alot of coolant all over the lefthand side and the oil filter. I phoned the dealer and gave them my whole story, they told me to check the coolant level and it was below minimum (after 200km) well they collected it yesterday and say that they would need to take it for a ride and do a report to BMW for a warranty claim. I must say that I am a bit pissed off, but will wait and see what their response is.