I have the same problem since a few days. Tried every "solution" I could find online, but nothing worked. Also tried to 'refresh' the firmware via DJI Assistant 2... but that didn't work. Because it doesn't recognize my drone or rc (very strange, but I read a lot of people having problems with Assistant).
So I end up erasing everything in my profile, even the firmware on my drone. Then switched power off and on again. Installed firmware en took it for a fly. No problems at all!
Second testrun (after switching to new battery), same problem occurred again.. but with the message 'Strong wireless interference". I walked up about 20 meters away from the first stop. Power off/on again and I could fly ..
So i'm hoping the problem is fixed now. Trying to fly tomorrow at a few other spots as well (Ubud, Bali) , I'll let you know if it worked *Fingers crossed!*