I have the exact same problem. I am flying my
Mavic 2 Zoom here in Philippines, and there is almost no house or electricity nearby. So it is not a problem with interference.
I have bought a
Smart Controller and have confirmed that it is the aircraft that is failing to make a 2.4 GHz connection. Even if I have the drone on the ground, I will frequently lose video connection if I leave the setting on Dual or 2.4GHz. But if I switch to 5.8GHz, then it can fly perfectly ok.
I also paid for the FCC mod to increase the transmission power, and I can fly with 5.8GHz only up to 500m straight up, and also 500m around my house, but of course 5.8GHz is not so good at longer distances (from what I understand.)
I have disassembled the unit a few times (trained EE) and cannot see anything obvious like a corroded antenna connection, so I am suspecting the forward leg antennae and thinking that I could try changing these quite cheaply and see if that would fix the problem.
Certainly the alternative to change the Core PCB is way too expensive to be worth the effort. ($337 from DJI, plus shipping and some complicated fan mounting.)
Anyone got any ideas that they can suggest? Perhaps someone crashed their drone and found the reception was reduced until they changed the front leg antennae??
Or did anyone try installing that old firmware and getting the reception back? But that is a long time ago now.
Thanks for any assistance or ideas.