I have a Model X 100D with the latest firmware 2018.18 4c72e69 I started experiencing the issue when since the 2018.14 firmware upgrade. At first I noticed my MCU was hung when there was no chime when I had the turn signal on. I then realized that the entire MCU was hung, I lost the streaming music, LTE connectivity, navigation maps, etc. I was able to later reproduce it by setting a destination for the navigation system to calculate the route. However, it does not happen all the time. The LTE connectivity will eventually come back after 3 to 5 minutes. Is anyone experiencing the same issue? I had an appointment at the SC and they did switch out the LTE connectivity board once. Thanks.