View your flight logs, make some notes distances, elevation when RTH kicks in. Weak remote signal doesn't get logged. Remote loss does. So after RTH kicks in you can cancel by pressing right switch down. I put the switch back up to return to GPS mode.
Also my unit hovering at the weak point and holding the remote solid, the signal level would bounce Good, Bad, Weak, Lost etc. I also set my unit out a long distance on a tall chair or plastic garbage can, didn't even need to fly it to see it fail.
I called a friend asked him if he had a spectrum analyzer, he did but it didn't go up to the 5.8 ghz freq.
Very frustrating