Couple of comments to help make sure you haven't done something that I and others have mistakenly done in the past with new drones:
1) Ensure all the little protective film pieces are removed from over your obstacle detection sensor windows. I know it sounds like nothing that you could miss, but sometimes they are very thin & hard to see unless you are specifically doing the "Remove Before Flight" examination of your aircraft.
2) Go into the Settings menu to the SAFETY Tab and turn OFF the Radar Map display option - Obstacle Detection still works, it just should not show the random Obstacle Detected red arcs on your viewing screen.
3) Go into setup and run through ALL of the Sensor calibration processes. May not solve a thing but sometimes it does.
If that doesn't solve your issue, I would definitely contact DJI and start a return/replacement process like
@wco81 suggests above.
Hopefully you get the new bird working correctly.