yesterday i set up a DJI flamewheel 450 with APM2 Misionplanner 1.1.92 and firmware 2.6

all went well i did mange to tune it to a stable hover and on my last outing i deside to try ALT-Hold and as soon as I switch it over copter was very unstable then i switch back to stable mode and suddenly copter rolls and twill to the ground.

I did have a suspicion that i maybe lost radio contact that copter went into fail save.

one thing that i did notice before as soon as i put it in alt hold or loiter copter drastically drop in alt seems like the baro did not work.

Log file is attach

when playing the log file at 72% is where i sw to alt hold.

and someone confirm what happen if amp2 went to Failsave or not. 

If it the failsave it would be the 2de time i lost radio contact 1ste time my copter fly away.

seems like my Hitec Aurora9 radio is not after all so wonderful.