I fly my F450 with APM 2.6 AC3.2. This month I had 2 similar incidents where the quad just fell during mid flight in Position Hold mode. The motors slowed down for no reason. First time I had a crash with broken props and GPS mast. The second time I have raised throttle to max during the fall and it recovered. It was slightly windy during the time of flight. Below are the specs of the quad and attached are the logs. Could anyone figure it out what might be the cause. I flew the same quad number of times without any issues.
Frame: F450
Motors, ESC, Props: 930KV 2212, DYS 30A SimonK with 10x4.5 props
Battery: Zippy 3S 2200mAh
FC: APM 2.6 AC3.2 firmware, Ublox 6 GPS Compass
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Thanks for the reply. Initially I had issues with Alt hold mode due to excessive vibrations, incorrect Thr_Mid settings but everything is resolved and I have been flying the same quad for several months without any problem. Default Alt Hold PID worked for me & holding the altitude well (not nearer the surface due to ground effect). This is the first time the quad crashed due these strange reasons (Baro & GPS error). I don't understand what exactly happened. If GPS signal is lost then the quad should land (this is set in MP).