It is a known issue - i noticed the same a few days ago, and have logged data since. Today after a long drive my display went totally insane. It didnt update for 6 km - neither the distance - nor the energy consumption. However the average consumption dropped from 192 wh/km to 191 during the same period - without any change in the numbers on the display. I called the service number, and got transferred to the service desk, and had the pleasure of talking to a very service minded technician. I was told right away, that this is a known issue. Just an hour before i shot a video of the energy app jumping forward and back in displaying the consumption, and guess that the tech rep could use the video. I also told (and send data from my TeslaMS server) that I expierience the 6 km without data, and could tell the exact times as these were logged in TeslaMS. According to TeslaMS - and the API I could see that somewhere in the car there were communication - however not on the main display. Range logged by TeslaMS clearly shows that the vehicle is sending the data, so the issue must be within the 2 main CPU's for the system.
They are investigating further, but as for now they do not have a timeframe for a solution.