Since I updated the firmware on my P3 4K drone:

• The programmable flight modes have disappeared on Go app's interface (eg. Pt of Interest, Follow-me, )
• Drone will only fly to about 30m height
• Drone will only fly about 100m away from Home Point
  

...What's wrong? How do I fix this?

is it in "Beginner Mode"? sometimes after an update settings revert back to factory defaults

Go into the app, click on the little Me icon in bottom right and go to your account and Sign Out.
Close the app, go back into your account and sign in again.
That should fix everything.

We are having the same problem! But on a Phantom 4. The section to add in a max height has disappeared!

Hi, sir. Please follow the advice above and ensure that you are not in the Beginner Mode and log in the DJI Account. Please fly in a place with good GPS signal. If the problem remains, I would recommend you provide a screenshot of your image screen for further analysis.