Official comment
This is from the DJI documentation:
Based on your log files it looks like the aircraft is going up to 30 m and stopping just like it says in the highlighted text. This is a sign that you are not logged into you DJI account through Map Pilot Pro. This login apparently doesn't last through a battery change so you have to make sure you are logged in again. If you are not being given the chance to log into your DJI account through Map Pilot Pro you may need to open the DJI app and log in there after every battery change. Dumb, we know.
Also, make sure you have the most recent firmware versions installed.